TST allow failures in Python 2.x tests

2.x tests work, but hang at shutdown;
Docker image uses Python 3.4, so 2.x is less important.

Author: kmike

Diff for: .travis.yml

@@ -13,6 +13,11 @@ matrix:
           env: SPLASH_PYTHON_VERSION="venv" SPLASH_BUILD_PARALLEL_JOBS=2
         - python: "3.4"
           env: SPLASH_PYTHON_VERSION="venv" SPLASH_BUILD_PARALLEL_JOBS=2
+    allow_failures:
+        # Docker image uses Python 3.4; Python 2.x tests work,
+        # but hang at shutdown for some reason.
+        - python: "2.7"
+          env: SPLASH_PYTHON_VERSION="venv" SPLASH_BUILD_PARALLEL_JOBS=2
 
 
 before_install: