Install gerrit-2.4.2-17 on review.

Change-Id: I339183271421462efc2b1797140ed65729332be1
Reviewed-on: https://review.openstack.org/29200
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: James E. Blair <corvus@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins