Add gerrit rename-project plugin to Zuul

We want to start experimenting with the use of this plugin instead of
our manual rename process. To do that we need to build Gerrit images
with the plugin and the first step to doing that is to have Zuul manage
the plugin repo for us.

If you are curious details about the plugin can be found at:
  https://gerrit.googlesource.com/plugins/rename-project/+/refs/heads/stable-3.3/src/main/resources/Documentation/about.md

Change-Id: I8ab8d8b70f93d8c64f54f6fc45b369375be0fdbc

zuul/main.yaml

@@ -71,6 +71,7 @@
               - plugins/its-storyboard
               - plugins/javamelody
               - plugins/plugin-manager
+              - plugins/rename-project
               - plugins/replication
               - plugins/reviewers
               - plugins/reviewnotes