Summary:
This makes it possible to run all remotefilelog tests without others
It also avoids some issues with name collisions in the upcoming merge.
Test Plan: next commit is a merge and no conflicts in tests/
Reviewers: #sourcecontrol, ttung, durham, mitrandir, simonfar
Reviewed By: mitrandir, simonfar
Subscribers: mjpieters
Differential Revision: https://phabricator.intern.facebook.com/D3764379
Tasks: 12855049
Signature: t1:3764379:1472217061:67a0cc8f1fc29f991be08fe965679535ff6df27a
