agama-project / agama / 19173157227

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Fix an error allocating partitions within RAIDs (#2854)

## Problem

During some manual testing, @tacerus found a pretty serious bug in the
Agama storage proposal.

When distributing several partitions over several new MD RAIDs, it may
happen that Agama locates some of those partitions in the WRONG RAID
DEVICE!

That happened because Agama tried to optimize the size distribution of
those partitions, but in the process it ignored a very basic constraint:
the exact RAID in which those partitions should be created.

## Solution

Honor the relationship between new MDs and its partitions.

## Testing

Unit tests included

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