modified test pillars and README

README.rst

 Usage
 =====
 
-Galera Cluster for MySQL is a true Multimaster Cluster based on synchronous
+Galera Cluster for MySQL or Mariadb is a true Multimaster Cluster based on synchronous
 replication. Galera Cluster is an easy-to-use, high-availability solution,
 which provides high system uptime, no data loss and scalability for future
 growth.
       version:
         mysql: 5.6
         galera: 3
+      engine: mysql or mariadb
       master:
         enabled: true
         name: openstack
 Usage
 =====
 
-MySQL Galera check sripts
+MySQL/Mariadb Galera check sripts
 
 .. code-block:: bash
 

tests/pillar/master_cluster.sls

           6xiZViPc4VayFnhDIC1w1oBqlhyIZ0AG/D7gqvfYiG6mHO32kPtHEN6Qzny8
           -----END RSA PRIVATE KEY-----
 galera:
+  engine: mariadb
   master:
     enabled: true
     name: galeracluster

tests/pillar/single.sls

 galera:
+  engine: mariadb
   master:
     enabled: true
     name: galeracluster