Install Quantum on XenServer

For using the quantum plugin see: http://openvswitch.org/openstack/documentation/
You can:

• follow: [[[QuantumDevstack]]]
• ensure your VM network is not on a VLAN
• assuming you use Open vSwitch (default on XenServer 6.0.0 and later)
• run the quantum agent on Dom0
• add in nova.conf: xenapi_vif_driver=nova.virt.xenapi.vif.XenAPIOpenVswitchDriver

TODO - other steps not yet found.