Use rsync instead of synchronize module for remote copy

The synchronize module with delegation introduces complexity
with permissions which we really, really do not need to have
to deal with for a remote sync. So instead, we just use rsync
because it's simpler to use and understand.

Change-Id: I6fae5af8d59ea9499cc90a35f1d2f5176fbf9d04
Related-Bug: #1718356

tasks/cinder_install_source.yml

@@ -93,10 +93,14 @@
     - Restart cinder services
 
 - name: Copy cinder rootwrap filters
-  synchronize:
-    src: "/openstack/venvs/cinder-{{ cinder_venv_tag }}/etc/cinder/rootwrap.d/"
-    dest: /etc/cinder/rootwrap.d/
-  delegate_to: "{{ inventory_hostname }}"
+  command: >-
+    rsync --archive --itemize-changes --delete
+    /openstack/venvs/cinder-{{ cinder_venv_tag }}/etc/cinder/rootwrap.d/
+    /etc/cinder/rootwrap.d/
+  args:
+    warn: no
+  register: _copy_rootwraps
+  changed_when: _copy_rootwraps.stdout != ''
   notify:
     - Manage LB
     - Restart cinder services