Install MariaDB instead of MySQL Server

According to the Openstack docs (Kilo version, 2015 release), now you have to install MariaDB instead of MySQL because of compatibility and connection issues (I suffered them myself).
The config templates and everything else are OK, everything will work.

services/common/mysql.yaml

@@ -5,16 +5,16 @@
   gather_facts: True
   tasks:
 
-    - name: ensure mysql-server is installed
+    - name: ensure MariaDB is installed
       apt: 
-        pkg: mysql-server 
-        state: latest 
-        update_cache: yes 
+        pkg: mariadb-server
+        state: latest
+        update_cache: yes
         cache_valid_time: 600
 
     - name: ensure mysql is stopped
       service: 
-        name: mysql 
+        name: mysql
         state: stopped
 
     - name: install mysql config file that binds to management network interface