[WIP] Revert Py2

[lihaoyi-databricks]

Prospective revert of #5. That PR never made it into the version of rules_docker used in databricks/runtime, and seems to cause a test failure when I included it:

$ bazel run //connector/spark-jenkins/docker:spark-jenkins-it-image_finished_setup_new_rules_test 
Using Bazel Cache at grpcs://bazel-remote-grpc.private.staging.cloud.databricks.com
Using Scala Incremental Compilation
(02:28:58) INFO: Invocation ID: 6e77b23e-1cc1-4f69-a81e-4b5066b07dd4
(02:28:58) INFO: Current date is 2023-10-10
(02:28:59) INFO: Analyzed target //connector/spark-jenkins/docker:spark-jenkins-it-image_finished_setup_new_rules_test (60 packages loaded, 1122 targets configured).
(02:28:59) INFO: Found 1 target...
(02:29:01) WARNING: DownloadArtifacts multiplex-worker (id 2) can no longer be used, because its files have changed on disk:
bazel-out/host/bin/external/universe/bazel/artifacts/download.runfiles/runtime/external/universe/bazel/artifacts/constants/constants-jetty9-hadoop1_2.12_deploy.jar: 337830bbdf7f65139f3e479becd05694200b034f824ca6d51a8b6b5882181e24 -> b1d4529635350b7f473f53d91a9f671f7683bf10ca4872fe7b858d7d183f2b7d
bazel-out/host/bin/external/universe/bazel/artifacts/download.runfiles/runtime/external/universe/bazel/artifacts/downloader/downloader-jetty9-hadoop1_2.12_deploy.jar: 6031627a8173454463fea5bc52d088e142c1910e5dea3e466b28dce21b710092 -> 31f0ddd946b698a108108f0c98a97fe7340e99eb666fd8dc5bbadd1a3245f700
bazel-out/host/bin/external/universe/bazel/artifacts/download.runfiles/runtime/external/universe/bazel/artifacts/hashing/hashing-jetty9-hadoop1_2.12_deploy.jar: 4dd61d8822e99d18e2c898d75275a83b3840297cd61ccae8f7952b790f8dd109 -> d1dc0a144ab7a8bf71aeeccb877a3d0c50a3a5d95af7176916d43a62bd3c535f
bazel-out/host/bin/external/universe/bazel/artifacts/download.runfiles/runtime/external/universe/bazel/artifacts/proxying/proxying-jetty9-hadoop1_2.12_deploy.jar: 1a551fba0e25acfe5304a8c0e5f636232ed99dd6df931ccedb842df1a1452f71 -> 4d5bc370292ded3d59fbfc92a8e88a100b4669784180b6b1ab3b565dd3948797
bazel-out/host/bin/external/universe/bazel/artifacts/download.runfiles/runtime/external/universe/bazel/artifacts/worker/lib-jetty9-hadoop1_2.12_deploy.jar: 33bd4b273cd8d2d0459515ea11c409829881fdf38786bf2264db9796a2eae022 -> 0dcbbdb44cdc904808981c8344b10cf98fe9c2310b4d4eb7f165f48e8cbd6b71
bazel-out/host/bin/external/universe/bazel/artifacts/download.runfiles/runtime/external/universe/bazel/artifacts/worker/worker_deploy.jar: cc53da3852b42f4b1567d49ace6ea5369d5d69503da883e6da2911c9aa0419a3 -> f366b5c5d364d6eae6f8cdd91683f9c2b277d61737e71c2e8ec36e41182cdca9
bazel-out/host/bin/external/universe/bazel/artifacts/download.runfiles/runtime/external/universe/bazel/worker/bazel-worker-base-jetty9-hadoop1_2.12_deploy.jar: 14827d1924d70316ec21421e42ee98a4ffce394242a7640ef9ce18b93b32fc85 -> 220bddf425aa45057c7f593892a5d4f06d1b757f0055af88d0bd94736c37a51d
bazel-out/host/bin/external/universe/bazel/artifacts/download.runfiles/runtime/external/universe/bazel/worker/log4j_config-jetty9-hadoop1_2.12_deploy.jar: 850f7622db0b3ab11af27010e365768756e7198969b81ee4964866ec4da73884 -> 35932d031b6380a8e22d3bee8e02356859fec9c1b95efecd259e459263737842
bazel-out/host/bin/external/universe/bazel/artifacts/download.runfiles/universe/bazel/artifacts/constants/constants-jetty9-hadoop1_2.12_deploy.jar: 337830bbdf7f65139f3e479becd05694200b034f824ca6d51a8b6b5882181e24 -> b1d4529635350b7f473f53d91a9f671f7683bf10ca4872fe7b858d7d183f2b7d
bazel-out/host/bin/external/universe/bazel/artifacts/download.runfiles/universe/bazel/artifacts/downloader/downloader-jetty9-hadoop1_2.12_deploy.jar: 6031627a8173454463fea5bc52d088e142c1910e5dea3e466b28dce21b710092 -> 31f0ddd946b698a108108f0c98a97fe7340e99eb666fd8dc5bbadd1a3245f700
bazel-out/host/bin/external/universe/bazel/artifacts/download.runfiles/universe/bazel/artifacts/hashing/hashing-jetty9-hadoop1_2.12_deploy.jar: 4dd61d8822e99d18e2c898d75275a83b3840297cd61ccae8f7952b790f8dd109 -> d1dc0a144ab7a8bf71aeeccb877a3d0c50a3a5d95af7176916d43a62bd3c535f
bazel-out/host/bin/external/universe/bazel/artifacts/download.runfiles/universe/bazel/artifacts/proxying/proxying-jetty9-hadoop1_2.12_deploy.jar: 1a551fba0e25acfe5304a8c0e5f636232ed99dd6df931ccedb842df1a1452f71 -> 4d5bc370292ded3d59fbfc92a8e88a100b4669784180b6b1ab3b565dd3948797
bazel-out/host/bin/external/universe/bazel/artifacts/download.runfiles/universe/bazel/artifacts/worker/lib-jetty9-hadoop1_2.12_deploy.jar: 33bd4b273cd8d2d0459515ea11c409829881fdf38786bf2264db9796a2eae022 -> 0dcbbdb44cdc904808981c8344b10cf98fe9c2310b4d4eb7f165f48e8cbd6b71
bazel-out/host/bin/external/universe/bazel/artifacts/download.runfiles/universe/bazel/artifacts/worker/worker_deploy.jar: cc53da3852b42f4b1567d49ace6ea5369d5d69503da883e6da2911c9aa0419a3 -> f366b5c5d364d6eae6f8cdd91683f9c2b277d61737e71c2e8ec36e41182cdca9
bazel-out/host/bin/external/universe/bazel/artifacts/download.runfiles/universe/bazel/worker/bazel-worker-base-jetty9-hadoop1_2.12_deploy.jar: 14827d1924d70316ec21421e42ee98a4ffce394242a7640ef9ce18b93b32fc85 -> 220bddf425aa45057c7f593892a5d4f06d1b757f0055af88d0bd94736c37a51d
bazel-out/host/bin/external/universe/bazel/artifacts/download.runfiles/universe/bazel/worker/log4j_config-jetty9-hadoop1_2.12_deploy.jar: 850f7622db0b3ab11af27010e365768756e7198969b81ee4964866ec4da73884 -> 35932d031b6380a8e22d3bee8e02356859fec9c1b95efecd259e459263737842
(02:29:01) INFO: Destroying DownloadArtifacts multiplex-worker (id 2)
(02:29:01) INFO: Multiplexer process for DownloadArtifacts has closed its output stream
(02:29:01) INFO: Created new non-sandboxed DownloadArtifacts multiplex-worker (id 3), logging to /ephemeral/home/haoyi.li/.cache/bazel/_bazel_haoyi.li/529b17f0d7eccfb75b7cc34a49a29224/bazel-workers/multiplex-worker-3-DownloadArtifacts.log
Target //connector/spark-jenkins/docker:spark-jenkins-it-image_finished_setup_new_rules_test up-to-date:
  bazel-bin/connector/spark-jenkins/docker/spark-jenkins-it-image_finished_setup_new_rules_test
(02:29:07) INFO: Elapsed time: 9.163s, Critical Path: 7.95s
(02:29:07) INFO: 343 processes: 277 remote cache hit, 44 internal, 21 linux-sandbox, 1 worker.
(02:29:07) INFO: Running command line: external/bazel_tools/tools/test/test-setup.sh connector/spark-jenkins/docker/spark-jenkins-it-image_finished_setup_new_rules_test
(02:29:07) INFO: Build Event Protocol files produced successfully.
(02:29:07) INFO: Build completed successfully, 343 total actions
exec ${PAGER:-/usr/bin/less} "$0" || exit 1
Executing tests from //connector/spark-jenkins/docker:spark-jenkins-it-image_finished_setup_new_rules_test
-----------------------------------------------------------------------------
IDs in config file do not match generated IDs
Config IDs:
	sha256:88cc1a200eb9be206c4261e79d642c392d97980236a066f23434f4452f8212a7
	sha256:bf509d6bc5ecd3b1a3660fb5f167ce2e320f5cc532574217cd8ba179ca06bae9
	sha256:2af0e1f1e531af9c95e30c3f908f6431d635a173b866e39b5f480e9ff3a180b9
	sha256:4b07a7bca5b71a13357fc3f96dab8dd67a2ffb139410cd2fcd74a61fa8225255
	sha256:ec2571a0ee18471d728d3a67d909afcc922d8b0e49a3ab55c46663acba9a3808
	sha256:258dda35c1008b877e1bd1ca1a6e3dd575fb75f54d61765388d72d5893bc7ca3
	sha256:be28fd825c0f4d3e4f43019506f2541622522aeeb992d651aa310000265cf129
	sha256:7b384e9e4ed40ec506d8aa34d8c59442ad3910538feb8b50034c15be28776e70
	sha256:5e80a86007e5587eb359ebe2ab02b0034b63490321d7142af796626b2f537e77
	sha256:86c63e99c2265bc95e6c366d5d99e9f16674b0cc982293c57c300b29ead0fe15
	sha256:cd223edb84931690363255c14c8874ab047dafd096814cce98cf8f4ce3d563fe
	sha256:2d3e900e23fe83e7c8fc96d104a668e2e3da205cb70a474e3954aaf4270783ba
	sha256:fb5d885df3ff05e4c45ede3d8609eea12aa9b685b8db13236f68ee2c5b0d6973
	sha256:18305fd2ecf86f18f3db068c4816e06e2dbe04c4ccff50a6545b0ce37abae72c
	sha256:ffc02492ca45a56186cfff17a2be8a8a19c4f0c718de11d13ed28fd51d9ce4fe
	sha256:4f372f7ef8230b7638be23732368c0ab29a2f666167cc78192305a1178d61e05
Generated IDs:
	sha256:88cc1a200eb9be206c4261e79d642c392d97980236a066f23434f4452f8212a7
	sha256:bf509d6bc5ecd3b1a3660fb5f167ce2e320f5cc532574217cd8ba179ca06bae9
	sha256:2af0e1f1e531af9c95e30c3f908f6431d635a173b866e39b5f480e9ff3a180b9
	sha256:4b07a7bca5b71a13357fc3f96dab8dd67a2ffb139410cd2fcd74a61fa8225255
	sha256:ec2571a0ee18471d728d3a67d909afcc922d8b0e49a3ab55c46663acba9a3808
	sha256:258dda35c1008b877e1bd1ca1a6e3dd575fb75f54d61765388d72d5893bc7ca3
	sha256:be28fd825c0f4d3e4f43019506f2541622522aeeb992d651aa310000265cf129
	sha256:7b384e9e4ed40ec506d8aa34d8c59442ad3910538feb8b50034c15be28776e70
	sha256:5e80a86007e5587eb359ebe2ab02b0034b63490321d7142af796626b2f537e77
	sha256:86c63e99c2265bc95e6c366d5d99e9f16674b0cc982293c57c300b29ead0fe15
	sha256:cd223edb84931690363255c14c8874ab047dafd096814cce98cf8f4ce3d563fe
	sha256:2d3e900e23fe83e7c8fc96d104a668e2e3da205cb70a474e3954aaf4270783ba
	sha256:fb5d885df3ff05e4c45ede3d8609eea12aa9b685b8db13236f68ee2c5b0d6973
	sha256:18305fd2ecf86f18f3db068c4816e06e2dbe04c4ccff50a6545b0ce37abae72c
	sha256:6c117b0acfe9e1d8c1646cc9f11014816df12da2dc11636891ae810d65ab016b
	sha256:4f372f7ef8230b7638be23732368c0ab29a2f666167cc78192305a1178d61e05

For now, this PR allows us to preserve the status quo by removing that PR from the branch used in databricks/runtime, while including more recent changes.