Merge remote-tracking branch 'source/0-18-4-branch' #31

Job	Run time
lint code	50s
cross compilation	22s
check pinned dependencies (google.golang.org/grpc v1.59.0)	6s
check commits	0s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	3s
run macOS itest	50m 2s
check release notes updated	5s
RPC and mobile compilation check	5m 37s
sample configuration check	4m 3s
Sqlc check	2m 44s
run ubuntu itests (btcd, backend=btcd cover=1)	33m 34s
run unit tests (btcd unit-cover)	10m 26s
run windows itest	7m 54s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	40m 39s
run unit tests (unit tags="kvdb_etcd")	19m 15s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	41m 25s
run unit tests (unit tags="kvdb_postgres")	17m 34s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	43m 2s
run unit tests (unit tags="kvdb_sqlite")	17m 7s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	56m 27s
run unit tests (btcd unit-race)	36m 49s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	1h 16m 31s
run unit tests (unit-module)	1m 46s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	44m 3s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	1h 16m 31s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	44m 12s
run ubuntu itests (neutrino, backend=neutrino cover=1)	38m 48s
finish	3s
	11h 9m 58s

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