Combine plugin and pod paths into one KubeletPath

[jingxu97]

Instead of using pod and plugin paths, comebine them into one
kubeletPath option

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[k8s-ci-robot]

@jingxu97: Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jingxu97

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[k8s-ci-robot]

@jingxu97: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-kubernetes-csi-csi-proxy	e9fb936	link	/test pull-kubernetes-csi-csi-proxy

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[ddebroy]

Superseded by #150