Disallow Manual mode in validation.

[mattmoor]

Remove all of the snowflake handling associated with it.

[knative-metrics-robot]

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

File	Old Coverage	New Coverage	Delta
pkg/apis/serving/v1alpha1/service_lifecycle.go	97.1%	89.3%	-7.9
pkg/reconciler/service/service.go	89.5%	88.8%	-0.7

[vagababov]

Why do we still allow pinned though which has been deprecated even earlier?

[mattmoor]

@vagababov because we can move it forward, so we don't have to.

[jonjohnsonjr]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jonjohnsonjr, mattmoor

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Needs approval from an approver in each of these files:

• pkg/apis/OWNERS [mattmoor]
• pkg/reconciler/OWNERS [mattmoor]
• test/OWNERS [mattmoor]

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[mattmoor]

/hold

[mattmoor]

I added an early return nil at the point of our ConvertUp check, I'll do the same for the Build PR.

[jonjohnsonjr]

/lgtm

[mattmoor]

/hold cancel

[knative-metrics-robot]

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

File	Old Coverage	New Coverage	Delta
pkg/apis/serving/v1alpha1/service_lifecycle.go	97.1%	89.3%	-7.9
pkg/reconciler/service/service.go	89.5%	88.2%	-1.3