Merge pull request #51021 from zjj2wry/scale-selector-all

Automatic merge from submit-queue (batch tested with PRs 51021, 53225, 53094, 53219). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

"fix issue(#49965)kubectl scale also says that it can work based on a label selector or all"

**What this PR does / why we need it**:
Fixes #49965 #44800

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

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

hack/testdata/scale-deploy-1.yaml

@@ -0,0 +1,25 @@
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  labels:
+    run: hello
+  name: scale-1
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      run: hello
+  strategy:
+    rollingUpdate:
+      maxSurge: 1
+      maxUnavailable: 1
+    type: RollingUpdate
+  template:
+    metadata:
+      labels:
+        run: hello
+    spec:
+      containers:
+      - image: aronchick/hello-node:2.0
+        imagePullPolicy: IfNotPresent
+        name: hello

hack/testdata/scale-deploy-2.yaml

@@ -0,0 +1,25 @@
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  labels:
+    run: hello
+  name: scale-2
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      run: hello
+  strategy:
+    rollingUpdate:
+      maxSurge: 1
+      maxUnavailable: 1
+    type: RollingUpdate
+  template:
+    metadata:
+      labels:
+        run: hello
+    spec:
+      containers:
+      - image: aronchick/hello-node:2.0
+        imagePullPolicy: IfNotPresent
+        name: hello

hack/testdata/scale-deploy-3.yaml

@@ -0,0 +1,25 @@
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  labels:
+    foo: boo 
+  name: scale-3
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      run: hello
+  strategy:
+    rollingUpdate:
+      maxSurge: 1
+      maxUnavailable: 1
+    type: RollingUpdate
+  template:
+    metadata:
+      labels:
+        run: hello
+    spec:
+      containers:
+      - image: aronchick/hello-node:2.0
+        imagePullPolicy: IfNotPresent
+        name: hello