Updated openstack/openstack
Project: openstack/requirements  9c3d44f096617165869abf40e0de864c93a86ea2

restrict requests version with !=2.4.0

Related-Bug in requests:
https://github.com/kennethreitz/requests/issues/2192

Related-Bug: #1363979

Change-Id: I711f5e5fdaa17e22bad075b3f22a6c199dc255dc