Addresses issue https://github.com/pantsbuild/pants/issues/1202
Review Request #1866 - Created March 4, 2015 and submitted
options_bootstrapper.py will register the constant "WARN" as a synonym for "WARNING". This has a side effect of changing the output of the test.
ran:PANTS_DEV=1 ./pants test ./tests/python/pants_test/option ./tests/python/pants_test/logging
andPANTS_DEV=1 ./pants test ./tests/python/pants_test/logging
Before this change, the first invocation failed.