Use kolla tools for memcached configuration

This change updates the memcached service to leverage the kolla
configuration to configure and launch the memcached service. This is the
same pattern we use for the other services.

Related-Bug: #1871734
Change-Id: Ib0bfc3e9009357f0aed28c0a10b927c5ca2e53a7

deployment/memcached/memcached-container-puppet.yaml

@@ -138,6 +138,7 @@ outputs:
                 - 'v'
                 - ''
         memcached::disable_cachedump: true
+        memcached::logfile: '/var/log/memcached/memcached.log'
       service_config_settings:
         collectd:
             tripleo.collectd.plugins.memcached:
@@ -153,7 +154,18 @@ outputs:
         step_config: |
             include ::tripleo::profile::base::memcached
         config_image: {get_param: ContainerMemcachedConfigImage}
-      kolla_config: {}
+      kolla_config:
+        /var/lib/kolla/config_files/memcached.json:
+          command: bash -c $* -- eval source /etc/sysconfig/memcached; exec /usr/bin/memcached -p ${PORT} -u ${USER} -m ${CACHESIZE} -c ${MAXCONN} $OPTIONS
+          config_files:
+            - source: "/var/lib/kolla/config_files/src/*"
+              dest: "/"
+              merge: true
+              preserve_properties: true
+          permissions:
+            - path: /var/log/memcached
+              owner: memcached:memcached
+              recurse: true
       docker_config:
         step_1:
           memcached:
@@ -168,8 +180,20 @@ outputs:
               list_concat:
                 - {get_attr: [ContainersCommon, volumes]}
                 -
-                  - /var/lib/config-data/memcached/etc/sysconfig/memcached:/etc/sysconfig/memcached:ro
-            command: ['/bin/bash', '-c', 'source /etc/sysconfig/memcached; exec /usr/bin/memcached -p ${PORT} -u ${USER} -m ${CACHESIZE} -c ${MAXCONN} $OPTIONS']
+                  - /var/lib/kolla/config_files/memcached.json:/var/lib/kolla/config_files/config.json:ro
+                  - /var/lib/config-data/puppet-generated/memcached:/var/lib/kolla/config_files/src:rw,z
+                  - /var/log/containers/memcached:/var/log/memcached:rw
+            environment:
+              KOLLA_CONFIG_STRATEGY: COPY_ALWAYS
+      host_prep_tasks:
+        - name: create persistent directories
+          file:
+            path: "{{ item.path }}"
+            state: directory
+            setype: "{{ item.setype }}"
+            mode: "{{ item.mode }}"
+          with_items:
+            - { 'path': /var/log/containers/memcached, 'setype': container_file_t, 'mode': '0750' }
       upgrade_tasks: []
       external_upgrade_tasks:
         - when: