Redis: fix podman start on reboot
Redis: fix podman start on reboot

This patch updates the tripleo_redis.service systemd unit
so that it recreates the /var/run/redis directory and sets
the SELinux context accordingly after a reboot. Previously
it would fail on reboot as these files are created via Ansible
only during deployment.

Change-Id: I4df04007098b610936d172ecfc5a92dcb1fb3fdc
Closes-bug: #1816444

openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates