Fix a back-compat bug in multi-port services

Yu-Ju changed something just before this went in that exposed this bug.
we did not re-run Travis on my PR.  Bad us.

pkg/api/v1beta1/conversion.go

@@ -710,6 +710,7 @@ func init() {
 			}
 
 			// Produce legacy fields.
+			out.Protocol = ProtocolTCP
 			if len(in.Spec.Ports) > 0 {
 				out.PortName = in.Spec.Ports[0].Name
 				out.Port = in.Spec.Ports[0].Port

pkg/api/v1beta2/conversion.go

@@ -641,6 +641,7 @@ func init() {
 			}
 
 			// Produce legacy fields.
+			out.Protocol = ProtocolTCP
 			if len(in.Spec.Ports) > 0 {
 				out.PortName = in.Spec.Ports[0].Name
 				out.Port = in.Spec.Ports[0].Port