Connect bridge with interface also for GRE and VXLAN

Change-Id: Ie9091813ce42e8efb6697837844b4a708bb047c3
Fixes: rhbz#1072268
Provision Demo/Tempest Separation

Packstack should be able to deploy Tempest in a standalone mode or in a full
configuration (with the user demo or another one given by the user).

Change-Id: I4874540edd60fa87cb853cdfdc6cc169600f5a50
Fixes: rhbz#1111969
Merge "Provision Demo/Tempest Separation"
Merge "Connect bridge with interface also for GRE and VXLAN"