Some of the "check-acceptance" tests are still skipped in the CI
since the docker images do not provide the necessary packages, e.g.
the netcat binary. Add them to get more test coverage.

Message-Id: <20201023073351.251332-5-thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>