Correct mariadb_ctrl submodule path

[#79749706]
Fix galera healthcheck submodule path in bump_green_modules

[#79749706]
Fix broker registrar path in bump_green_modules

[#79749706]
Don't autobump broker-registrar

It's annoying to check on travis since it's in pivotal cf, and since
it's shared, it's not clear we want to get changes right away anyway.

[#79749706]