- refactor redirect a bit to store multi-line results to a temporary file
- new show-prepare-results stage using that
- prepare and show-prepare-results shouldn't be NoTime, since they're
predictable.
- lock host thru depends -> junk in the junk case.
acquiring the lock is done thru polling in the child, so that it doesn't block
dpb proper.
- new "junk" stage that gathers dependencies and deletes them.
4d52ff4e54