Add a unique device identifier

[vojtechtrefny]

The new device_id identifier is meant to be unique even for devices with the same name. The primary user for this will be Anaconda which needs an ID that will be a unique string stable between reset() calls.

The device ID looks as follows:

• name for disks, partitions and loop devices
• LVM-<name> for LVM VGs and LVs
• BTRFS-<uuid>-<name> for btrfs volumes and subvolumes
• STRATIS-<name> for Stratis devices
• LUKS-<name> for LUKS mapped devices
• MDRAID-<name> for MD arrays
• DM-<name> for generic DM devices

Btrfs is currently the only device type that allows duplicate names for volumes so UUID is used for btrfs volumes. For other devices (LVM, MD...) the device name must be unique so we can use the name with technology prefix.

[vojtechtrefny]

Jenkins, test this please.