iomodules/router: change API to add static routes
iomodules/router: change API to add static routes

API received a port number, that information is not available in many cases in
the control plane, then it is better to receive the port name instead.

iovisor/iovisor-ovn,netgroup-polito/iovisor-ovn,iovisor/iovisor-ovn,netgroup-polito/iovisor-ovn