Integrate disk support labels into NodeGetInfo

[hajiler]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind feature

What this PR does / why we need it:
This PR is a pre-requisite for the generic volumes feature. It adds disk types supported by a node to the topology information using NodeGetInfo. The PR will be followed up by using this topology information to select a compatible disk type when provisioning a volume.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:
Node attach limit override and the disk type labels rely on reading the Node k8s object. Instead of repeating this request, I migrated it out to NodeGetInfo and piped down the Node object. This also allowed me to add more comprehensive unit testing.

Does this PR introduce a user-facing change?:

NONE

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[k8s-ci-robot]

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[hajiler]

/test all

[sunnylovestiramisu]

/assign @tonyzhc

[cemakd]

Nit: You can rename err to nodeErr and avoid having to set it to nil in the if statement.

[cemakd]

Let's add a test case where node is nil as well, just to add coverage for the node == nil case