* Add update freeze option
* Freeze to auto update and plugin condition
* Add tests
* Add supervisor_version evaluation
* OS updates require supervisor up to date
* Run version check during startup
Hassio supervisor saves backups in tar files that contains compressed
tar archives, this is convenient when such backups are kept in the same
environment or need to be transferred remotely, but it's not convenient
when they will be processed using other backup tools such as borg or
restic that can handle compression, encryption and data deduplication
themselves.
In fact deduplication won't actually work at all with hassio compressed
backups as there's no way to find common streams for such tools (unless
we make them to export the archives during importing as borg's
import-tar can do), but this would lead to archives that are not easily
recoverable by the supervisor.
So, make possible to pass a "compressed" boolean parameter when creating
backups that will just archive all the data uncompressed.
It will be then up to other tools to manage the archives compression.
* Notify HA Core when backup is being executed
Notify Home Assistant Core using the Websocket API when the Home Assistant
config directory is about to get backed up. This makes sure the Core can
prepare the SQLite database (if active) so it safe to make a backup.
* Only close WebSocket connection on connection errors
Let regular WebSocket errors bubble to the caller so they can be handled
explicitly.
* Add version restriction to backup/start/end WS commands
* Restore Home Assistant metadata when Home Assistant is selected
* De-duplicate Backup/Restore logic
Create internal _do_backup()/_do_restore() method which de-duplicates
some of the backup/restore logic previously part of full/partial backup/restore.
* Add Backup/Restore test coverage
