Fix crash on missing run_cleanup

plugin.sh

@@ -74,7 +74,7 @@ run_purge() {
 
   # try and remove all secrets; Docker will leave ones which are in use
   docker -H "$DOCKER_HOST" secret ls --format '{{ .Name }}' | xargs -i sh -c "echo {}; docker -H \"$DOCKER_HOST\" secret rm {} || true"
-  echo "--- end cleanup ---"
+  echo "--- end purge ---"
 }
 
 run_plugin() {
@@ -91,7 +91,6 @@ run_plugin() {
 
   if [ "$PLUGIN_PURGE" == "true" ]; then
     run_purge
-    run_cleanup
   fi
 
   echo "--- end ssh-stack-deploy ---"