iotests: Basic tests for internal snapshots

We have a few test cases that include tests for corner case aspects of
internal snapshots, but nothing that tests that they actually function
as snapshots or that involves deleting a snapshot. Add a test for this
kind of basic internal snapshot functionality.

The error cases include a regression test for the crash we just fixed
with snapshot operations on inactive images.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20231201142520.32255-4-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

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