Merge "Mount /var/run/redis for the redis socket" into stable/queens

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: