add missing module to requirements.txt

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
mdlog requests don't try to decode json response

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
fix partial workqueue termination

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>