doc: enhance the example case

Signed-off-by: Paul Bastide <[email protected]>

examples/03-deployment.yaml

@@ -2,7 +2,6 @@ apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: ex-device-plugin
-  namespace: ex-device-plugin
   labels:
     app: ex-device-plugin
 spec:

examples/README.md

@@ -1 +1,15 @@
+### Example
+0. Create namespace `oc new-project ex-device-plugin`
+1. Install `kustomize build examples/ | oc apply -f -`
+2. Uninstall `kustomize build examples/ | oc delete -f -`
+
+To remove stuck namespace:
+
+```
+oc get namespace "ex-device-plugin" -o json \
+  | tr -d "\n" | sed "s/\"finalizers\": \[[^]]\+\]/\"finalizers\": []/" \
+  | oc replace --raw /api/v1/namespaces/ex-device-plugin/finalize -f -
+```
+
+### Storage Class Tests
 You will need to change `storageclass-tbd` in 03-pvc.yaml to work with your storageclass.