Bump mock and six 3rdparty versions to latest
Bump mock and six 3rdparty versions to latest

This resolves http://bugs.python.org/issue17826

Testing Done:
CI green @ https://travis-ci.org/pantsbuild/pants/builds/75690041

Bugs closed: 1992

Reviewed at https://rbcommons.com/s/twitter/r/2633/

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