Follow-up from "Resolve "Process reconfigure failures and print out a message""

The following discussion from !2140 (merged) should be addressed:

• @marin started a discussion: (+1 comment)

  So we pull in rainbow due to a dependency from packagecloud, so I'll use that for output. We might consider adding an explicit dependency on that, as the Geo guys are using it in a gitlab-ctl command as well.