T4670 Remove the any-author flag from the which command, make any-author the default, and annotate the username of the owner of the revision.

Summary: Remove any-author flag from 'arc which' make any-author be the default behavior. Annotate revision with the owners username.

Test Plan:
Apply a patch that you don't own (arc patch Dxxx) run 'arc which' verify that:

1. You see the revision
2. You see the original authors username next to the revision (owned by sjobs) etc.

Reviewers: epriestley, Blessed Reviewers

Reviewed By: epriestley, Blessed Reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D8690