libvirt: remove unused get_ovs_interfaceid()
libvirt: remove unused get_ovs_interfaceid()

This method has not been used since:
  Icf948f6ee1c0da2327fb5eac61fec6e89ac30531

Change-Id: Ib69ab14b6002967c4c4178a35182cccfd59b6a7c
Signed-off-by: Sahid Orentino Ferdjaoui <f799991784850b8d4b84e1fdbe797720df9aae1a@redhat.com>

mahak/nova,gooddata/openstack-nova,openstack/nova,mikalstill/nova,mikalstill/nova,gooddata/openstack-nova,mahak/nova,gooddata/openstack-nova,rahulunair/nova,mahak/nova,rahulunair/nova,klmitch/nova,rahulunair/nova,mikalstill/nova,openstack/nova,gooddata/openstack-nova,klmitch/nova,openstack/nova,klmitch/nova,klmitch/nova