* Add priliminary support for running the OVS L2 and DHCP agents
in domU:
* Configure Nova to use the correct vif driver and integration
bridge.
* Configure the ovs agent to target the dom0 integration bridge.
* Install a xapi plugin supporting dom0 execution of ovs agent
commands.
* Config doc: http://wiki.openstack.org/QuantumDevstackOvsXcp
* Supports blueprint xenapi-ovs
Change-Id: If5ab07daab1dc3918004eb4bfb6fed6cab0a71fd