Mount /var/run/redis for the redis socket

Under pacemaker, it manages this mount correctly. When not deploying
redis with pacemaker, the /var/run/redis folder is not properly mounted
so the container cannot start correctly after a reboot.

Change-Id: I1b86bc91e7ca95a1e70fecee1b6507787d98e9cd
Closes-Bug: #1771888
(cherry picked from commit 1d9629ec0b)

docker/services/database/redis.yaml

@@ -126,6 +126,7 @@ outputs:
                   - /var/lib/config-data/puppet-generated/redis/:/var/lib/kolla/config_files/src:ro
                   - /etc/localtime:/etc/localtime:ro
                   - /var/log/containers/redis:/var/log/redis
+                  - /var/run/redis:/var/run/redis
                 environment:
                   - KOLLA_CONFIG_STRATEGY=COPY_ALWAYS
             - if: