openSUSE / agama / 8175514785

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Extend storage D-Bus API (#1071)

## Problem

The current result of the storage proposal is presented as a list of
actions, which could make a bit complex to understand the overall
picture of the resulting devices.

That list of actions is going to be replaced by a more visual
representation of the devices. To make this possible, more information
about the devices has to be exported on D-Bus.

* Part of https://trello.com/c/7TTVVquM.

## Solution

Add the following information to D-Bus:

* The list of actions includes the SID of the affected device.
* The partition table exports the unused slots.
* The LVM devices (volume groups, physical volumes and logical volumes)
are exported.
* The block devices includes their start block and also indicates
whether the device is encrypted.
* The staging devices are exported. 

NOTE: This PR goes to a feature branch instead of master.

## Testing

* Added unit tests
* Tested manually

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