Rename KUBE_NODE_NAME to NODE_NAME

[zhucan]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
Rename KUBE_NODE_NAME to NODE_NAME, no need to use both of them.

Which issue(s) this PR fixes:

Fixes #615

Special notes for your reviewer:
@xing-yang

Does this PR introduce a user-facing change?:

Rename KUBE_NODE_NAME to NODE_NAME

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[xing-yang]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: xing-yang, zhucan

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[xing-yang]

@zhucan Can you backport this PR to release-5.0 branch?

[zhucan]

@zhucan Can you backport this PR to release-5.0 branch?

yes