add yosemite to macOSXSeries
Move backupsMetaC into backups.go.
Move state/backups.go to state/backups/storage.go.
Use the common implementation for getting a new State.
Add a note about dropping the corresponding function in state.
Use *state.State rather than the temp surrogate interfaces.
Fix a couple storage names.
Gut the backup plugin, but keep it around for backward-compatibility.
Use the old plugin code for 1.20.
Add a deprecation warning message.
Add a TODO comment about removing the plugin.
Improve the visibility of the divider comment.
Skip new backups for 1.21 as well.
did ALL THE THINGS; uniter_test passing again; loads of cleanup to do
better reboot-error handling/layering in RunCommands
Add yosemite
Extract common method for fetching network interface id for instance
Skeleton implementation of ReleaseAddress
Skeleton (failing) test
Fix a missed change.