* Supporting the quantum dhcp agent on XenServer/XCP requires
modifying the ovs agent. As no unit tests exist at present for
the ovs agent, this change adds enough test coverage to help
ensure that the modifications to support xen will not break
existing functionality.
* Supports blueprint xenapi-ovs
Change-Id: Ib99414ec02e8910cbb0ce377b1a1e73acd057794