Merge pull request #23988 from php-coder/kubectl_describe_multiline_labels

Automatic merge from submit-queue

kubectl describe: show multiple labels/annotations on multiple lines

Small UX improvement: when there is more than one label/annotation, it's more readable to see them on the different lines.

Before:
```console
$ kubectl describe svc
Name:			s2i-test
Namespace:		test2
Labels:			app=s2i-test,foo=bar
...
```
After:
```console
$ kubectl describe svc
Name:			s2i-test
Namespace:		test2
Labels:			app=s2i-test
				foo=bar
...
```
This change affects output of the labels/annotations in many of the sub-commands of the `kubectl describe`.

PTAL @smarterclayton @kargakis

test/e2e/kubectl.go

@@ -640,7 +640,8 @@ var _ = framework.KubeDescribe("Kubectl client", func() {
 					{"Name:", "redis-master-"},
 					{"Namespace:", ns},
 					{"Node:"},
-					{"Labels:", "app=redis", "role=master"},
+					{"Labels:", "app=redis"},
+					{"role=master"},
 					{"Status:", "Running"},
 					{"IP:"},
 					{"Controllers:", "ReplicationController/redis-master"},
@@ -658,7 +659,8 @@ var _ = framework.KubeDescribe("Kubectl client", func() {
 				{"Namespace:", ns},
 				{"Image(s):", redisImage},
 				{"Selector:", "app=redis,role=master"},
-				{"Labels:", "app=redis,role=master"},
+				{"Labels:", "app=redis"},
+				{"role=master"},
 				{"Replicas:", "1 current", "1 desired"},
 				{"Pods Status:", "1 Running", "0 Waiting", "0 Succeeded", "0 Failed"},
 				// {"Events:"} would ordinarily go in the list
@@ -674,7 +676,8 @@ var _ = framework.KubeDescribe("Kubectl client", func() {
 			requiredStrings = [][]string{
 				{"Name:", "redis-master"},
 				{"Namespace:", ns},
-				{"Labels:", "app=redis", "role=master"},
+				{"Labels:", "app=redis"},
+				{"role=master"},
 				{"Selector:", "app=redis", "role=master"},
 				{"Type:", "ClusterIP"},
 				{"IP:"},