R1:e5de7f08436d

Update templates used with mercurial to remove '--debug'

Summary:
Refer to discussion on D21677#275541

Refs D21681 (arcanist changes)

Phabricator has several uses of the `--debug` flag being used with Mercurial. Use of this flag causes additional output to be added which Phabricator needs, however the behavior of `--debug` is not guaranteed to be stable, and in newer versions of Mercurial there have been additional output that has caused Phabricator to choke on parsing the output. This change removes…