Restart recheckwatch on update.

Change-Id: Ic872e215abcd33256e64b8dd8baaf83555f07172
Reviewed-on: https://review.openstack.org/23593
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins