Add Mercurial support to rbt land
Review Request #9744 — Created March 5, 2018 and updated — Latest diff uploaded
rbt land supports Git, this change adds support for Mercurial as well.
rbt landworks on bookmarks in mercurial.
Mercurial supports merging and deleting bookmarks but not pushing upstream because
bookmarks are usually not shared with the upstream, so it is left to the user to
decide what they push.
Ran all unit tests
Added unit tests for the new mercurial client functions.
rbt landcommands on a Mercurial repository including