Allow configurable root directory on the host

[gnufied]

Currently the volume root directory is defined as:

	provisionRoot      = "/csi-data-dir"

But IIRC, it used to be tmp before. I think we need this path to be stable in e2e, so as we don't have to update the YAMLs if the code changes. The best way of doing this perhaps to make the root directory configurable, so as e2es can keep using paths they were using and other users can define new path.

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