Factor issue and edit MR form label field and submit.
Fail harder in the backup script

This change also shows the output of failed Git commands during the
backup.
Merge branch 'backup_fail_hard' into 'master'

Fail harder in the backup script

See merge request !1143
Merge branch 'factor-issue-mr-form-label' of https://github.com/cirosantilli/gitlabhq

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Conflicts:
	app/views/projects/merge_requests/_form.html.haml
Merge branch 'master' of dev.gitlab.org:gitlab/gitlabhq