Implement NodeGetInfo

[codenrhoden]

What this PR does / why we need it:
This patch implements the CSI NodeGetInfo endpoint. For our purposes
right now, this just needs to return the Node ID, which is actually the
VM UUID as read from /sysfs with a conversion applied.

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:
This PR builds off of two prior PRs, #107, and #106. Those will need to be merged first so this can be rebased on top of them.

Release note:

Node

[k8s-ci-robot]

Hi @codenrhoden. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[davidvonthenen]

/lgtm

[codenrhoden]

/retest

[k8s-ci-robot]

@codenrhoden: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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[dougm]

/ok-to-test

[dougm]

/lgtm

tests should pass after rebase to include #119

[dougm]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dougm

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