Add no_log to prevent leaking

Current galera install leaks sql passwords in standard output, patching
it with no_log.

Change-Id: Ia170e4f25e35984e68b4cd47c3d964a034236d11
(cherry picked from commit 3665575c52)

tasks/galera_install_apt.yml

@@ -74,6 +74,7 @@
     value: "{{ item.value }}"
     vtype: "{{ item.vtype }}"
   with_items: "{{ galera_debconf_items }}"
+  no_log: yes
 
 - name: Prevent galera from starting on install
   copy: