Use Node informer to prevent hitting the API server for all time

[mucahitkurt]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
Use Node informer instead of hitting the API server for all Node resource request.

Which issue(s) this PR fixes:
Fixes #144

Special notes for your reviewer:
I used the commit from the PR: #327, I can also change that PR to add node informer.

Does this PR introduce a user-facing change?:

NONE

cc @msau42 @verult

[k8s-ci-robot]

Hi @mucahitkurt. Thanks for your PR.

I'm waiting for a kubernetes-csi or 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[msau42]

/ok-to-test

[msau42]

/assign @verult

[mucahitkurt]

/test pull-kubernetes-csi-external-provisioner-1-13-on-kubernetes-1-13
/test pull-kubernetes-csi-external-provisioner-unit

[mucahitkurt]

@verult PTAL

[verult]

/lgtm

[msau42]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: msau42, mucahitkurt

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