Updated haproxy config to use one galera server with other two as backup.
Updated haproxy config to use one galera server with other two as backup.

The haproxy config for the galera servers now use one main server to do all
the reads and writes against. The other two servers are used as backups for
high-availability.

pythonvietnam/salt-openstack,pythonvietnam/salt-openstack,EntropyWorks/salt-openstack,pythonvietnam/salt-openstack,pythonvietnam/salt-openstack,EntropyWorks/salt-openstack,EntropyWorks/salt-openstack