Invoke node Update only for providerID changes

[chethanv28]

What this PR does / why we need it:
This PR is addressing the issue mentioned here: #131
We need to make sure nodeRegister is called only when we observe change in the ProviderID.

Which issue this PR fixes
Fixes #131

Special notes for your reviewer:

Release note:

Invoke NodeRegister only when Provider Id change is observed.

[k8s-ci-robot]

Hi @chethanv28. Thanks for your PR.

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[chethanv28]

/assign @divyenpatel

[divyenpatel]

/ok-to-test

[akutz]

Hi @chethanv28,

Also, the issue description needs to be updated. The fixes bit shouldn't be code-quoted or else it won't work. It should be:

Fixes #131

[akutz]

Also, it's cool to see people still use GoCSI :)

[divyenpatel]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chethanv28, divyenpatel

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[divyenpatel]

/lgtm