Instead of providing vars to and including the keystone_init_systemd for
each keystone uwsgi program, loop over those program names within the
tasks.
This also prevents the /etc/tmpfiles.d/keystone.conf file from being
overwritten twice on every run.
Backport note:
This has been adapted to include the changes required
for upstart.
Change-Id: I00dc80db7f6672fb26af0ec2301b3a4ea451844d
(cherry picked from commit 1b8a085b79)
ae05a84d3c