Fix regression for bare metal nodes

When running on bare metal, the log folders are created in advance
to /openstack/log/aio1-memcached in a /var/log/memcached link.

The task ``Create memcached log dir`` would then fail with:
``/var/log/memcached already exists as a link``,
because the folder exists, and the exit 1 after the chown
would trigger.

This replaces the code with a more idempotent code:
If a change would be detected by chown -c, it would be listed
in the stdout, while the rc would still be 0.
An error in chown would still be rc != 0.

So we can use this different state to mark the task as changed
or not, and handle the create folder case when no folder exists.

Change-Id: I904f13d2ae02cd410edc4aaeb83bedd1e14d69fb

tasks/memcached_config.yml

@@ -16,19 +16,28 @@
 - name: Test for log directory or link
   shell: |
     if [ -h "{{ memcached_log | dirname }}"  ]; then
-      chown -h root:root "{{ memcached_log | dirname }}"
-      chown -R root:root "$(readlink {{ memcached_log | dirname }})"
+      chown -c -h root:root "{{ memcached_log | dirname }}"
+      chown -c -R root:root "$(readlink {{ memcached_log | dirname }})"
+    else
       exit 1
     fi
   register: log_dir
   failed_when: false
-  changed_when: log_dir.rc == 1
+  changed_when: log_dir.rc == 1 or "changed" in log_dir.stdout
+
+- name: Show the changes if verbose
+  debug:
+    var: log_dir.stdout_lines
+    verbosity: 1
+  when: "'changed' in log_dir.stdout"
 
 - name: Create memcached log dir
   file:
     path: "{{ memcached_log | dirname }}"
     state: directory
-  when: log_dir.rc != 0
+    owner: root
+    group: root
+  when: log_dir.rc == 1
 
 - name: Apply memcached config
   template: