Improve nat role

Several changes made: nat_server_role: feed in IP OF VLAN PRIVATE ADDRESS to we can work out name of eth device. Templates device names in iptables Gluster_roles: add quorum command. Also modifies ping value in a conf file in an (unsuccessful) attempt to solve issues on first build Minor modes in sql role to improve comments and to remove issue with next version of ansible removes default repos that get reinstalled after a yum update