Configure storage for image registry (openshift#1185)

By default, on baremetal platforms, the image registry operator is
configured without persistent storage.  Here, we configure it with
"emptyDir", and set its management state to managed.  This is needed for
e2e test.

06_create_cluster.sh

@@ -22,4 +22,8 @@ for name in dnsmasq ironic-inspector ; do
     sudo podman ps | grep -w "$name$" && sudo podman stop $name
 done
 
+# Configure storage for the image registry
+oc patch configs.imageregistry.operator.openshift.io \
+    cluster --type merge --patch '{"spec":{"storage":{"emptyDir":{}},"managementState":"Managed"}}'
+
 echo "Cluster up, you can interact with it via oc --config ${KUBECONFIG} <command>"