Similar to https://github.com/JonnyJD/python-discid/issues/18
we should implement some tests that actually work with a cd drive.

These can't run on `make check`, because that is run on install/build time.

However, these are quite valuable since right now there is a huge part of libdiscid that is not tested in a structured manner. We only have discid and discisrc. These display data gathered from disc, but don't verify it and don't display a test summary.

These tests are targeted at devs, but also users that are willing to test against a couple of their cds (on their platform).