Btrfs2 (#787)

* All the changes needed to make btrfs subvolumes work. It boils down to two points;
the handling of the addressing of subvolumes re. physical partitions, and the small changes at the bootloader level
* We added a new script only_hd for testing purposes. It only handles hadrd drive management
* restoring an escape hatch during subvolume processing
* hipercommented manage_btrfs_subvolumes
* Ready to be able to select and process options in subvolume mounting
* Separte nodatacow processing
* Solving a flake8 complain
* Use of bind names @ get_filesystem_type
* compress mount option bypass
* Preparations for encryption handling
* Compatibility to master version re. encrypted btrfs volumes
* Now we can create subvolumes and mountpoints inside an encrypted btrfs partition
* changes for entries file generation with systemd-bootctl
* flake8 corrections plus some comments

Co-authored-by: Anton Hvornum <anton@hvornum.se>

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