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It does not always pre-roll again after seeking / pausing.

See gstreamer/gst-rtsp-server!64

The version of libav used on the CI crashes in various ways.
Hopefully these issues will go away when we upgrade the image
to Fedora 30, as these don't occur on my machine.

There was a bug, fixed by
gstreamer/gst-plugins-good!275,
where qtdemux would drop the entire last GOP in reverse playback (so
in that test, the only GOP). Let's make sure we don't regress.

So scenarios and testsuite can know where the root directory is

It has been fixed now

This would ensure the following issue doesn't appear again:
gstreamer/gst-plugins-good#591

For gst-build 1.16.0

For gst-build build of 1.15.90

Strictly speaking single-item lists don't need commas but I think it's better
for consistency. Lists containing more than one item need a comma separator
though. :)

And it can happen on any scenario, so take that into account

Making simpler to follow in the future