[finishes #47829427] Add `bosh delete user` command
OCD
[finishes #44721035] Certificates should be valid for a short time in the past
[finishes #48340181] Generate passwords with SecureRandom instead of Haddock

This way we don't need to install the `wamerican` package to get
the word lists.
[#47829427] Stub out the target to make sure we do not read from local config