auto detect kubeletRootDirPath

[deeghuge]

Is your feature request related to a problem? Please describe.
As of Today, CSI has this option in CR to update kubeletRootDir if it is different than default
kubeletRootDirPath - The kubelet root directory path is used in case the Kubernetes setup uses a nondefault kubelet root directory path. The default kubelet's root directory is at /var/lib/kubelet.

Here instead of asking user for input, if we can explore if this can be auto detected

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