Update Test 1 / "connectivity_test" to confirm expected endpoints

[lauralorenz]

Per the KEP, we must test that

Test cluster A can contact service imported from cluster B and route to expected endpoints.

Today, the connectivity_test (which I also refer to as Test 1) confirms the first part ("contact") but does not confirm the second part ("route to expected endpoints"). It does this by confirming that something responded to a request for the Service IP, and that its response contains some text it expects (reference).

This issue is done when this test also gathers the expected pod IPs for the pods in the deployment backing the Service in the source cluster B first*, and then confirming during the connectivity test that it is those IPs and only those IPs that are responding to the Service IP request.

*This should probably be done by collecting the source cluster's Pod.Spec.IPs through the k8s API, and probably be implemented in a separate method that can be used by Test 3 later.

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/lifecycle stale

[lauralorenz]

/assign knee-berts
/remove-lifecycle stale

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/remove-lifecycle stale

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[lauralorenz]

/assign lauralorenz
@knee-berts is helping me with this one