libvirt: drop MIN_LIBVIRT_UEFI_VERSION
libvirt: drop MIN_LIBVIRT_UEFI_VERSION

We now require libvirt 1.2.9 as a minimum so
we can drop this compatibility code. Apparently
there was never a test for this condition.

Change-Id: I09757492a2968a0e0a73cf60003a83fd84139f4f

klmitch/nova,gooddata/openstack-nova,gooddata/openstack-nova,vmturbo/nova,rajalokan/nova,vmturbo/nova,gooddata/openstack-nova,openstack/nova,klmitch/nova,Juniper/nova,klmitch/nova,phenoxim/nova,klmitch/nova,mahak/nova,mikalstill/nova,rahulunair/nova,Juniper/nova,rajalokan/nova,mahak/nova,rahulunair/nova,mikalstill/nova,rajalokan/nova,mikalstill/nova,vmturbo/nova,jianghuaw/nova,phenoxim/nova,rahulunair/nova,Juniper/nova,jianghuaw/nova,mahak/nova,jianghuaw/nova,openstack/nova,Juniper/nova,gooddata/openstack-nova,openstack/nova,vmturbo/nova,rajalokan/nova,jianghuaw/nova