add vtn service; rename service_onos_vtn to service_onos_cord
add vtn service; rename service_onos_vtn to service_onos_cord

cboling/xos,jermowery/xos,cboling/xos,jermowery/xos,xmaruto/mcord,xmaruto/mcord,cboling/xos,xmaruto/mcord,xmaruto/mcord,cboling/xos,jermowery/xos,cboling/xos,jermowery/xos