Add ability to switch database driver

Also added mysqlconnector packages into default installation.

blueprint enable-mysql-connector

Change-Id: Ib2cda7cb183dc8f0ff4759cc6e9ecab469fd121c
diff --git a/files/rpms-suse/keystone b/files/rpms-suse/keystone
index 403d82f..a734cb9 100644
--- a/files/rpms-suse/keystone
+++ b/files/rpms-suse/keystone
@@ -10,5 +10,6 @@
 python-greenlet
 python-lxml
 python-mysql
+python-mysql.connector
 python-pysqlite
 sqlite3