Differentiate between source root categories.
Review Request #4230 — Created Sept. 13, 2016 and submitted
Source roots now know whether they are "source", "test" or
This allows us to get rid of the "go_remote" hack in go_buildgen.py.
In the future this may end up being useful for other things.
CI passes: https://travis-ci.org/pantsbuild/pants/builds/159487089