Due to how Kuryr implements service networking, NodePort services are
not supported and nobody brought up a good case for their support.
Without this fix, we'd not generate a proper spec but we'd try to
process them ending up in failure.
Change-Id: I1e02a7a7fdfd2a49b0759f959adedf038bf1ca6e
Closes-Bug: #1774634
Signed-off-by: Antoni Segura Puimedon <antonisp@celebdor.com>