Summary:
If the user is using remote bookmarks, let's hide the public heads from the
smartlog output. This allows the server to do a non-fastward bookmark move,
without having the old heads cluttering the user's smartlog output.
Test Plan: Added a test
Reviewers: mitrandir, rmcelroy, ericsumner, lcharignon
Reviewed By: lcharignon
Differential Revision: https://phabricator.fb.com/D2264878
Signature: t1:2264878:1437505970:664348ed91ba8d8b1018299e282ed4308bfbdbc0
