Use knative/pkg/webhook to host the webhook controller.

[n3wscott]

Moves to use the shared controller in /pkg.
Removes all eventing/pkg/webhook/ code because it is no longer needed 🎉

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: n3wscott
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[n3wscott]

This will depend on #344 being merged. Will reopen when that has landed.

[knative-prow-robot]

@n3wscott: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-knative-eventing-go-coverage	3401405	link	/test pull-knative-eventing-go-coverage
pull-knative-eventing-build-tests	3401405	link	/test pull-knative-eventing-build-tests
pull-knative-eventing-unit-tests	3401405	link	/test pull-knative-eventing-unit-tests
pull-knative-eventing-integration-tests	3401405	link	/test pull-knative-eventing-integration-tests

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