allow v1services to be addressable

[iancoffey]

Fixes #410

Proposed Changes

Allow Service/v1 resources to be special cased and addressable to its conventional hostname.

Release Note

Allow Service/v1 resources to be special cased and addressable to its conventional hostname.

[knative-prow-robot]

Hi @iancoffey. Thanks for your PR.

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[grantr]

/ok-to-test

[knative-metrics-robot]

The following is the coverage report on pkg/.
Say /test pull-knative-eventing-sources-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/controller/sinks/sinks.go	94.1%	94.7%	0.6

[iancoffey]

/assign @n3wscott

[grantr]

/lgtm

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: grantr, iancoffey

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