Go indexer: Ensure imported package vnames have their language set.
Go indexer: Ensure imported package vnames have their language set.

Summary:
The vname provided by a required import may not have the language tag set; make
sure to include the language when generating vnames.

Reviewers: #core_team, shahms

Reviewed By: #core_team, shahms

Differential Revision: https://phabricator-dot-kythe-repo.appspot.com/D1328

bzz/kythe,bzz/kythe,legrosbuffle/kythe,kythe/kythe,bzz/kythe,legrosbuffle/kythe,bzz/kythe,legrosbuffle/kythe,legrosbuffle/kythe,benjyw/kythe,legrosbuffle/kythe,legrosbuffle/kythe,benjyw/kythe,benjyw/kythe,benjyw/kythe,benjyw/kythe,kythe/kythe,bzz/kythe,benjyw/kythe,legrosbuffle/kythe,kythe/kythe,kythe/kythe,bzz/kythe,legrosbuffle/kythe,bzz/kythe,kythe/kythe,bzz/kythe,benjyw/kythe,kythe/kythe,kythe/kythe,benjyw/kythe,benjyw/kythe,benjyw/kythe,bzz/kythe,kythe/kythe,kythe/kythe,kythe/kythe,benjyw/kythe,benjyw/kythe,legrosbuffle/kythe,kythe/kythe,legrosbuffle/kythe,legrosbuffle/kythe,bzz/kythe,bzz/kythe,bzz/kythe