Since [1] Buck spam standard output with debug messages in test failure
case. Monkey patch the java_test() rule to avoid it. Also file the
upstream issue to change the default log level from debug to info: [2].
[1] cc05fdbedc
[2] https://github.com/facebook/buck/issues/505
Change-Id: I04c86a9bacdd188724a79268ef879f676ec35217