Add current device to the tables

[joseivanlopez]

Problem

As part of the new Partitioner UI, the current device should be included in all its tables. For example, when we go to a specific MD, the table for its partitions shows the MD device as well.

• Part of https://trello.com/c/NITXJRBE/2055-menu-driven-interface-finish-it

NOTE: this is only a first step. The resulting UI would use nesting rows with the current device as root. But nesting tables is still a WIP feature in libyui, see https://github.com/libyui/libyui/pull/171.

Solution

Add the current device to all the tables where it is needed:

• In the partitions of a device (disk, MD, Bcache).
• In the used devices of a BIOS RAID, Multipath, MD, Bcache, Btrfs
• In the Logical Volumes of a VG
• In the Physical Volumes of a VG.

Testing

• Added new unit tests
• Tested manually

Screenshots

[coveralls]

Coverage decreased (-0.0007%) to 97.075% when pulling b9034c7 on joseivanlopez:add_current_device into bf6daa8 on yast:partitioner-ui-02.

[ancorgs]

LGTM