Our current systemd unit files do not work with type=forking, it does
work with type=simple. This also means we can drop the PIDFile, as it
is only used by forking.
Change-Id: Ia9a2e54b91e9b2430c612b2edfa07077f7248539
Signed-off-by: Paul Belanger <pabelanger@redhat.com>
Also modify the Zuul From Scratch doc to reference these new files
in the service installation documents.
Depends-On: https://review.openstack.org/560993
Change-Id: Ifa0d1cd48ec5e1ef3358ada55b1b2769f392dfe9