Ignore non-avaiable volumes in findMatchingVolume: update tests

- Use VolumeAvaiable instead of empty or pending phase in tests
- Add a test case to verify findMatchingVolume will not choose
  non-avaiable PVs if it's not pre-bind
- Add a test case to verify syncClaim will not choose non-avaibalbe PVs
  if it's not pre-bind

pkg/controller/volume/persistentvolume/scheduler_binder_test.go

@@ -494,6 +494,9 @@ func makeTestPV(name, node, capacity, version string, boundToPVC *v1.PersistentV
 			},
 			StorageClassName: className,
 		},
+		Status: v1.PersistentVolumeStatus{
+			Phase: v1.VolumeAvailable,
+		},
 	}
 	if node != "" {
 		pv.Spec.NodeAffinity = getVolumeNodeAffinity(nodeLabelKey, node)