Add reboot collection to state
Respond to feedback
Remove dependency on apiserver/params
exact error messages in assert
renamed error
split up SetReboot
responded to feedback
Command working well.
Add some backups testing helpers.
Drop the "archivable" interface.
Update error output, add the tests.
Tweaks after review.
More review tweaks.
Clean up fake error handling.
Add some doc comments.
Move a private function below the public ones.
Clarify the content place-holders.
Merge pull request #869 from ericsnowcurrently/backups-fakes

Add some backups testing helpers.
More review tweaks.
Update juju/utils dependency and fix vet warnings

Bump juju/utils to latest version for lp:1367896 fix. Also
fix go vet warnings in state/upgrades.go debug messages.