Configure gerritbot to log into /var/log/gerritbot.
Change-Id: I24f8602eaa0f779de9d455cda8ad692f932ebd39
Reviewed-on: https://review.openstack.org/11939
Approved: James E. Blair <corvus@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins