According to Openstack summit session  stestr is
maintained project to which all Openstack projects
Let's switch it then.
1. remove unused requirement: mock-requests. This is due to the fact
that is is unused.
2. Update sphinx
3. Uncap evenlet: uncap eventlet. We will manage the eventlet
version using constraints now. See the thread starting at
for more details.
4. Update RYU to be 4.24 to sort out issues with pip 10
Co-Authored-By: Doug Hellmann <firstname.lastname@example.org>