Merge pull request #44897 from msau42/local-storage-plugin

Automatic merge from submit-queue (batch tested with PRs 46076, 43879, 44897, 46556, 46654)

Local storage plugin

**What this PR does / why we need it**:
Volume plugin implementation for local persistent volumes.  Scheduler predicate will direct already-bound PVCs to the node that the local PV is at.  PVC binding still happens independently.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: 
Part of #43640

**Release note**:

```
Alpha feature: Local volume plugin allows local directories to be created and consumed as a Persistent Volume.  These volumes have node affinity and pods will only be scheduled to the node that the volume is at.
```

pkg/volume/testing/testing.go

@@ -134,6 +134,10 @@ func (f *fakeVolumeHost) GetSecretFunc() func(namespace, name string) (*v1.Secre
 	}
 }
 
+func (f *fakeVolumeHost) GetNodeLabels() (map[string]string, error) {
+	return map[string]string{"test-label": "test-value"}, nil
+}
+
 func ProbeVolumePlugins(config VolumeConfig) []VolumePlugin {
 	if _, ok := config.OtherAttributes["fake-property"]; ok {
 		return []VolumePlugin{