fix busybox image to 1.28 (issues with nslookup).

Changes where done with these commands:

reprec 'image: busybox(?!:)' 'image: busybox:1.28' */docs */examples
reprec -- '--image=busybox(?!:)' '--image=busybox:1.28' */docs */examples

Related issues:

 https://github.com/docker-library/busybox/issues/48
 https://github.com/kubernetes/kubernetes/issues/66924

content/en/examples/pods/init-containers.yaml

@@ -14,7 +14,7 @@ spec:
   # These containers are run during pod initialization
   initContainers:
   - name: install
-    image: busybox
+    image: busybox:1.28
     command:
     - wget
     - "-O"

content/en/examples/pods/inject/dependent-envars.yaml

@@ -10,7 +10,7 @@ spec:
       command:
         - sh
         - -c
-      image: busybox
+      image: busybox:1.28
       env:
         - name: SERVICE_PORT
           value: "80"

content/en/examples/pods/security/hello-apparmor.yaml

@@ -9,5 +9,5 @@ metadata:
 spec:
   containers:
   - name: hello
-    image: busybox
+    image: busybox:1.28
     command: [ "sh", "-c", "echo 'Hello AppArmor!' && sleep 1h" ]

content/en/examples/pods/security/security-context.yaml

@@ -12,7 +12,7 @@ spec:
     emptyDir: {}
   containers:
   - name: sec-ctx-demo
-    image: busybox
+    image: busybox:1.28
     command: [ "sh", "-c", "sleep 1h" ]
     volumeMounts:
     - name: sec-ctx-vol

content/en/examples/pods/share-process-namespace.yaml

@@ -8,7 +8,7 @@ spec:
   - name: nginx
     image: nginx
   - name: shell
-    image: busybox
+    image: busybox:1.28
     securityContext:
       capabilities:
         add:

content/en/examples/pods/storage/projected-secret-downwardapi-configmap.yaml

@@ -5,7 +5,7 @@ metadata:
 spec:
   containers:
   - name: container-test
-    image: busybox
+    image: busybox:1.28
     volumeMounts:
     - name: all-in-one
       mountPath: "/projected-volume"

content/en/examples/pods/storage/projected-secrets-nondefault-permission-mode.yaml

@@ -5,7 +5,7 @@ metadata:
 spec:
   containers:
   - name: container-test
-    image: busybox
+    image: busybox:1.28
     volumeMounts:
     - name: all-in-one
       mountPath: "/projected-volume"

content/en/examples/pods/storage/projected-service-account-token.yaml

@@ -5,7 +5,7 @@ metadata:
 spec:
   containers:
   - name: container-test
-    image: busybox
+    image: busybox:1.28
     volumeMounts:
     - name: token-vol
       mountPath: "/service-account"

content/en/examples/pods/storage/projected.yaml

@@ -5,7 +5,7 @@ metadata:
 spec:
   containers:
   - name: test-projected-volume
-    image: busybox
+    image: busybox:1.28
     args:
     - sleep
     - "86400"