Suppress command/shell warnings

This patch prevents warnings from being thrown when using rpm,
yum, or dnf with a shell or command module.

Change-Id: I8707aa2652aed643b6ddfb20bfd843b226e9bb61

tasks/galera_install_yum.yml

@@ -76,6 +76,8 @@
 # cleaned out whenever the repo config changes.
 - name: Force the expiry of the repo metadata
   command: "{{ ansible_pkg_mgr }} clean metadata"
+  args:
+    warn: no
   when: add_repos | changed
   tags:
     - galera-repos

tasks/galera_secure_mysql.yml

@@ -36,6 +36,7 @@
     service mysql stop
   args:
     creates: "{{ mysql_securely_configured }}"
+    warn: no
   tags:
     - galera_server-config
     - galera-rhel-config

tasks/galera_upgrade_check_yum.yml

@@ -15,6 +15,8 @@
 
 - name: Check major galera install version
   command: "rpm -qi '{{ galera_mariadb_server_package }}'"
+  args:
+    warn: no
   failed_when: false
   register: installed_galera_specific
   when: