Fail earlier instead of using defaults

[nicksardo]

• Ingresses targeting services that are not typed NodePort or LoadBalancer should fail and not create any additional resources.
• translator.ToURLMap should not need to fetch backend services. They were asserted earlier.

[rramkumar1]

1. Will be fixed by Code to setup removal of ServicePort logic out of translator  #214, which is a WIP
2. Fixed by Refactor translator.ToURLMap to not re-fetch backend services #207

[nicksardo]

Need to decide what's desirable behavior when the sync fails but the URL map references a backend service that should be GC'd. Maybe we continue to update the URL map on error? Maybe GC is smarter and updates the URL map to stop referencing the backend service? Maybe the backend service is stuck around until the ingress is fixed?

[rramkumar1]

/assign

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