When issuing a 'Revert' the committer will now be the logged in user

When doing a Revert from UI, the committer will now be the user
that pressed the button. The preferred email address will be chosen
if the user has several registered with Gerrit.

Previously Gerrit was set as a committer, which caused confusion
for our users.

Change-Id: Ie1b4ed69719a4c27a398b5992da5e38d7e73df47
1 file changed