Remove redis-proxy example

The docker image is nowhere to be found, so lets remove it.
There have been a request for the Dockerfile here [1], but nobody
seems to care.

redis-proxy is replaced with redis-master in test-cmd-util.sh, to
ensure that the tests still works.
The redis-proxy pod in test/fixtures/doc-yaml/user-guide/multi-pod.yaml
is replaced with valid-pod from test/fixtures/doc-yaml/admin/limitrange/valid-pod.yaml,
so redis-proxy is removed every where.

[1] https://github.com/kubernetes/kubernetes/issues/4914#issuecomment-77209779

hack/make-rules/test-cmd-util.sh

@@ -460,15 +460,15 @@ run_pod_tests() {
   kube::test::get_object_assert pods "{{range.items}}{{$id_field}}:{{end}}" ''
   # Command
   kubectl create -f test/fixtures/doc-yaml/admin/limitrange/valid-pod.yaml "${kube_flags[@]}"
-  kubectl create -f examples/storage/redis/redis-proxy.yaml "${kube_flags[@]}"
-  # Post-condition: valid-pod and redis-proxy PODs are created
-  kube::test::get_object_assert pods "{{range.items}}{{$id_field}}:{{end}}" 'redis-proxy:valid-pod:'
+  kubectl create -f examples/storage/redis/redis-master.yaml "${kube_flags[@]}"
+  # Post-condition: valid-pod and redis-master PODs are created
+  kube::test::get_object_assert pods "{{range.items}}{{$id_field}}:{{end}}" 'redis-master:valid-pod:'
 
   ### Delete multiple PODs at once
-  # Pre-condition: valid-pod and redis-proxy PODs exist
-  kube::test::get_object_assert pods "{{range.items}}{{$id_field}}:{{end}}" 'redis-proxy:valid-pod:'
+  # Pre-condition: valid-pod and redis-master PODs exist
+  kube::test::get_object_assert pods "{{range.items}}{{$id_field}}:{{end}}" 'redis-master:valid-pod:'
   # Command
-  kubectl delete pods valid-pod redis-proxy "${kube_flags[@]}" --grace-period=0 --force # delete multiple pods at once
+  kubectl delete pods valid-pod redis-master "${kube_flags[@]}" --grace-period=0 --force # delete multiple pods at once
   # Post-condition: no POD exists
   kube::test::get_object_assert pods "{{range.items}}{{$id_field}}:{{end}}" ''
 
@@ -783,12 +783,12 @@ __EOF__
   kube::test::get_object_assert pods "{{range.items}}{{$id_field}}:{{end}}" ''
   # Command
   kubectl create -f test/fixtures/doc-yaml/user-guide/multi-pod.yaml "${kube_flags[@]}"
-  # Post-condition: valid-pod and redis-proxy PODs exist
-  kube::test::get_object_assert pods "{{range.items}}{{$id_field}}:{{end}}" 'redis-master:redis-proxy:'
+  # Post-condition: redis-master and valid-pod PODs exist
+  kube::test::get_object_assert pods "{{range.items}}{{$id_field}}:{{end}}" 'redis-master:valid-pod:'
 
   ### Delete two PODs from 1 yaml file
-  # Pre-condition: redis-master and redis-proxy PODs exist
-  kube::test::get_object_assert pods "{{range.items}}{{$id_field}}:{{end}}" 'redis-master:redis-proxy:'
+  # Pre-condition: redis-master and valid-pod PODs exist
+  kube::test::get_object_assert pods "{{range.items}}{{$id_field}}:{{end}}" 'redis-master:valid-pod:'
   # Command
   kubectl delete -f test/fixtures/doc-yaml/user-guide/multi-pod.yaml "${kube_flags[@]}"
   # Post-condition: no PODs exist
@@ -1244,14 +1244,14 @@ run_kubectl_get_tests() {
   kube::test::get_object_assert pods "{{range.items}}{{$id_field}}:{{end}}" ''
   # Command
   kubectl create -f test/fixtures/doc-yaml/user-guide/multi-pod.yaml "${kube_flags[@]}"
-  # Post-condition: PODs redis-master and redis-proxy exist
+  # Post-condition: PODs redis-master and valid-pod exist
 
   # Check that all items in the list are printed
   output_message=$(kubectl get -f test/fixtures/doc-yaml/user-guide/multi-pod.yaml -o jsonpath="{..metadata.name}" "${kube_flags[@]}")
-  kube::test::if_has_string "${output_message}" "redis-master redis-proxy"
+  kube::test::if_has_string "${output_message}" "redis-master valid-pod"
 
   # cleanup
-  kubectl delete pods redis-master redis-proxy "${kube_flags[@]}"
+  kubectl delete pods redis-master valid-pod "${kube_flags[@]}"
 }
 
 run_kubectl_request_timeout_tests() {