Queue ReadinessProbe Kubelet Header e2e Test

[joshrider]

- e2e test verifies that readiness probe receives kube-probe header

Co-authored-by: Joshua Rider jrider@pivotal.io

Supports #4649

Proposed Changes

• changes the /_healthz endpoint of the runtime test image to /healthz.
• changes /healthz path of runtime test image to return HTTP Status 400 if kubelet's User-Agent headers are not present
• adds an end-to-end test with a ReadinessProbe hitting runtime's /healthz path to verify the queue-proxy's addition of kubelet's User-Agent header

Release Note

NONE

[knative-prow-robot]

@joshrider: 0 warnings.

In response to this:

• e2e test verifies that readiness probe receives kube-probe header

Co-authored-by: Joshua Rider jrider@pivotal.io

Supports #4649

Proposed Changes

• changes the /_healthz endpoint of the runtime test image to /healthz.
• changes /healthz path of runtime test image to return HTTP Status 400 if kubelet's User-Agent headers are not present
• adds an end-to-end test with a ReadinessProbe hitting runtime's /healthz path to verify the queue-proxy's addition of kubelet's User-Agent header

Release Note

NONE

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[shashwathi]

/assign @mattmoor

[mattmoor]

Just a nit about placement otherwise LGTM. thanks!

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[shashwathi]

@mattmoor : Moved the file to conformance package. Ready for another review 👍

[shashwathi]

/test pull-knative-serving-integration-tests

[mattmoor]

/lgtm
/approve

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