Delete update_users.py since this script is not used any more.
Use update_gerrit_users.py instead.
Change-Id: Ie72b565df058a34e044921288013498b5be9477e
Reviewed-on: https://review.openstack.org/12487
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins