private_ip not needed anymore in seeds + added br-ex and port creation using physical_interface

Hi openstackers,

For the bridge creation/physical interface setup, it requires the following vswitch patch:
https://github.com/packstack/puppet-vswitch/pull/1

If this goes through then that's it for GRE.
Although this one needs to be made more generic for adding VLANs along.

Cheers
Gil