Do not log passwords

This prevents data to be leaked into the callback plugin.

Change-Id: I7fce6153cfbdc33c12421b1b78458d49b962f8e8
(cherry picked from commit 2a80a32549)

playbooks/common-tasks/mysql-db-user.yml

@@ -21,6 +21,7 @@
     name: "{{ db_name }}"
     state: "present"
   delegate_to: "{{ groups['galera_all'][0] }}"
+  no_log: True
   tags:
     - common-mysql
 
@@ -37,5 +38,6 @@
     append_privs: "{{ db_append_privs | default(omit) }}"
   delegate_to: "{{ groups['galera_all'][0] }}"
   with_items: "{{ grant_list | default(['localhost', '%']) }}"
+  no_log: True
   tags:
     - common-mysql