Add integration test for cf set-label for routes with ports
Add integration test for cf set-label for routes with ports

We originally left this integration test commented out since it relied
on the `--port` flag for `cf create-route`. This functionality has now
been pushed to master, so this commit uncomments the integration test.

[#172665133]

Co-authored-by: Belinda Liu <496afffef642eb3807bf00ef2898c80e8c6b937c@pivotal.io>
Co-authored-by: Merric de Launey <79964dcbacbf8006d1234555614dad3bcf49e6d6@pivotal.io>

cloudfoundry/cli,cloudfoundry/cli,cloudfoundry/cli