We need additional python packages to run check-acceptance. Add them to the docker images we will be using later. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Thomas Huth <thuth@redhat.com> Message-Id: <20200701135652.1366-26-alex.bennee@linaro.org>