Add in-tree gerrit submodules to googlesource
This way we can have zuul clone them all and ignore the submodule
machinery.
projects:
- gerrit
- plugins/delete-project
+ - plugins/download-commands
+ - plugins/hooks
- plugins/importer
- plugins/its-base
- plugins/its-storyboard
- plugins/javamelody
+ - plugins/replication
+ - plugins/reviewnotes
+ - plugins/singleusergroup
- plugins/verify-status
