ensure /root/.my.cnf is 0600 and root owned

explicitly set /root/.my.cnf's owner and mode to ensure it will be
created with as root owned and 0600. This change fixes #357

Author: igalic

manifests/server/root_password.pp

@@ -12,6 +12,8 @@
 
     file { "${::root_home}/.my.cnf":
       content => template('mysql/my.cnf.pass.erb'),
+      user    => 'root',
+      mode    => '0600',
       require => Mysql_user['root@localhost'],
     }
   }