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
(cherry picked from commit 71e9b806b4)

deployment/memcached/memcached-container-puppet.yaml

@@ -138,6 +138,7 @@ outputs:
                 dport: 11211
                 proto: 'tcp'
                 source: {get_param: MemcachedIpSubnet}
+        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; /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: