OTN tp rate handling in otn-topology

We currently set the rate of a tp in the otn-topology, based on one of the supported rates on the logical connection-point (retrieved from the capabilities announced for a port).
However this is not the expected behaviour. The rate on a tp that does not support any service shall not be set, so that the PCE can identify whether a tp can be used or not to provision a service. Thus the rate shall be set only after a service has been provisionned, according to the interface type that has been set on the port.