Mark objectivec_cocoapods_integration as failing

.travis.yml

@@ -73,6 +73,10 @@ matrix:
     # we moved to an OS X image that is 10.11.
     - os: osx
       env: CONFIG=python_cpp
+    # This started failing with the OS X 10.12 / Xcode 8.1 image.
+    # https://github.com/google/protobuf/issues/2472
+    - os: osx
+      env: CONFIG=objectivec_cocoapods_integration
     # Mark the iOS test as flakey as xcodebuild some times fails to start the
     # iOS Simulator.
     - os: osx