actually validate semver in node controller rather than prefix checking

pkg/controller/node/nodecontroller_test.go

@@ -725,6 +725,20 @@ func TestCheckPod(t *testing.T) {
 			},
 			prune: true,
 		},
+		{
+			pod: api.Pod{
+				ObjectMeta: api.ObjectMeta{DeletionTimestamp: &unversioned.Time{}},
+				Spec:       api.PodSpec{NodeName: "older"},
+			},
+			prune: true,
+		},
+		{
+			pod: api.Pod{
+				ObjectMeta: api.ObjectMeta{DeletionTimestamp: &unversioned.Time{}},
+				Spec:       api.PodSpec{NodeName: "oldest"},
+			},
+			prune: true,
+		},
 		{
 			pod: api.Pod{
 				ObjectMeta: api.ObjectMeta{DeletionTimestamp: &unversioned.Time{}},
@@ -763,6 +777,26 @@ func TestCheckPod(t *testing.T) {
 			},
 		},
 	})
+	nc.nodeStore.Store.Add(&api.Node{
+		ObjectMeta: api.ObjectMeta{
+			Name: "older",
+		},
+		Status: api.NodeStatus{
+			NodeInfo: api.NodeSystemInfo{
+				KubeletVersion: "v0.21.4",
+			},
+		},
+	})
+	nc.nodeStore.Store.Add(&api.Node{
+		ObjectMeta: api.ObjectMeta{
+			Name: "oldest",
+		},
+		Status: api.NodeStatus{
+			NodeInfo: api.NodeSystemInfo{
+				KubeletVersion: "v0.19.3",
+			},
+		},
+	})
 
 	for i, tc := range tcs {
 		var deleteCalls int