adding socket to my.cnf

Change-Id: Id77cd6da330fe986844b3331edd514819471e67a

galera/files/my.cnf

@@ -26,6 +26,7 @@ default-storage-engine=innodb
 #log_error=/var/log/mysql/error.log
 skip-external-locking
 skip-name-resolve
+socket = /var/run/mysqld/mysqld.sock
 
 myisam_sort_buffer_size=64M
 wait_timeout=1800