Summary:
Upstream histedit has moved all it's actions to classes. Let's do the same for
stop.
The hashes change because upstream changed graft to include a little more
information in the commit metadata.
Test Plan: Ran tests
Reviewers: rmcelroy, sid0, lcharignon, pyd, ericsumner
Differential Revision: https://phabricator.fb.com/D2001830
Summary: Make stop compatible with the new hg tip
Test Plan: run tests, worked.
Reviewers: pyd, durham, sid0
Reviewed By: sid0
Differential Revision: https://phabricator.fb.com/D1623384