sched: adjust events to register for VolumeBinding plugin

[Huang-Wei]

What type of PR is this?

/kind cleanup
/sig scheduling

What this PR does / why we need it:

VolumeBinding plugin now registered NodeUpdate event.

kubernetes/pkg/scheduler/framework/plugins/volumebinding/volume_binding.go

Lines 105 to 108 in b0eac84

	// Pods may fail to find available PVs because the node labels do not
	// match the storage class's allowed topologies or PV's node affinity.
	// A new or updated node may make pods schedulable.
	{Resource: framework.Node, ActionType: framework.Add | framework.Update},

However, NodeUpdate is a superset of any changes of a node (labels, taints, conditions, etc.) This implies if a node's taints get changes, the pods failed by VolumeBinding plugin will also be moved back to activeQ (or backoffQ).

This PR changes NodeUpdate to one of sub-categories: NodeLabelUpdate and add a test to verify it.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

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[Huang-Wei]

/assign @cofyc

[k8s-ci-robot]

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[cofyc]

/lgtm