Test/test create partition mbr

[smoser]

• Add a test that that creates and verifies an MBR Table.

  The interface to creating a MBR is a bit hokey, but it does work. If a disko.Disk has a Table type of MBR, then CreatePartition will create a partition table of MBR type.

  Definitely this could use some work, as the filled-out ID and Name are ignored, and the PartitionType gets converted, but it does work.

[codecov[bot]]

Codecov Report

Base: 66.86% // Head: 66.86% // No change to project coverage :thumbsup:

Coverage data is based on head (467484a) compared to base (18e4a60). Patch has no changes to coverable lines.

Additional details and impacted files

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[hallyn]

The first commit (HASH) was already merged separately.