Allow using kube-apiserver cache for pod list requests

[hieurender]

Issue #, if available: #1017

Description of changes: Exposes the configuration use_apiserver_cache, which sets ResourceVersion: "0" when listing pods on a node.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[LikithaVemulapalli]

Hello @hieurender, thanks for opening a PR for the issue that you were facing. We added multiple configs earlier as per the requirements and were reluctant to adding additional configs to reduce complexity. We had seen some interest on this config from other users, we are happy to merge it. Could you please add some tests around the newly added config in config_test.go. Thanks

[hieurender]

@LikithaVemulapalli added the test you asked for.

I also added a second commit, as even with the first commit we noticed NTH was still doing quorum-lists of pods. We traced the source to the call drain.RunNodeDrain, which calls drainer.GetPodsForDeletion, which does not set ResourceVersion=0 in its ListOptions:

	podList := &corev1.PodList{}
	initialOpts := &metav1.ListOptions{
		LabelSelector: labelSelector.String(),
		FieldSelector: fields.SelectorFromSet(fields.Set{"spec.nodeName": nodeName}).String(),
		Limit:         d.ChunkSize,
	}

It was fairly straightforward to refactor so that we don't call this function.

[LikithaVemulapalli]

@hieurender could you please check the test failures and fix them. We observed these test failures for your changes related to latest commit, we can only approve them if there are no issues for the existing functionality, once the tests passes will review the changes. Thanks.

[hieurender]

I verified that make e2e-test passes locally 👍

[LikithaVemulapalli]

/lgtm, thanks for fixing :)

[hieurender]

@LikithaVemulapalli are there guidelines on releasing new versions? I'd love to be able to move off my fork.

[LikithaVemulapalli]

Hello @hieurender, we will be doing release in a timely basis every month, we will be doing release in mid July. Will update your original issue or this PR once this is included in the new release. Thanks