Py3: fix fetching of tar files
pytest_multihost does not support binary stdout stream yet,
https://pagure.io/python-pytest-multihost/issue/7 . Write logs to
temporary file and use host.get_file_content() to fetch them.
https://pagure.io/freeipa/issue/7131
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Michal Reznik <mreznik@redhat.com>
Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>