Add more coverages/tests for OSS pants publishing

[jinfeng]

We have a few regressions lately:

https://rbcommons.com/s/twitter/r/900
https://rbcommons.com/s/twitter/r/901

From @ity

Ity Kaul
4:52 PM (5 minutes ago)

to me, Stu, Andy 
ah, thats what I meant. Of course there are tests, I remember even fixing 
test_jar_publish_integration at some point. In fact, ci doesnt run one of them
since scaladoc is not installed on travis-ci, afair. 

whats missing are tests for all the targets that have "provides" a quick grep
will show you which ones and you can tackle them one by one (as Stu
mentioned the thrift targets such as java_thrift_library, java_protobuf_library
and so on). 

[ericzundel]

there have been many tests added to tests/python/pants_test/tasks/test_jar_publish_integration.py since this bug was filed.