Bug 1763340

Cause: An Ingress object specifies backends, where each backend specifies a target port name or number on some Service object. The Service's port in turn specifies a target port on a Pod object. Similarly to an Ingress backend, a Route object may specify a target port on a Service. When translating an Ingress backend to a Route, the ingress-to-route controller used the Service port's target port for the Route's target port when it should have used the Service port's name or number. Consequence: If an Ingress object used a Service port that had a target port with a different name or number from the Service port's name or number, the ingress-to-route controller could produce an invalid Route object. Fix: When translating the target port of an Ingress backend to the target port for a Route, the ingress-to-route controller now uses the Service port's name rather than its target port, or omits the target port entirely if it is not needed (as in the case of a Service that has only 1 port). Result: Ingress objects are now correctly translated to Route objects even if an Ingress backend targets a Service port that has a different name or number from the Service port's target port.