update requires to prevent version cap

OpenStack clients. None of these should have an upper bound
as that has implications for testing in the gate. An exception
is currently being made for neutron client because of the need
for an incompatible change in their next release.
https://github.com/openstack/requirements

fixes bug #1200214

Change-Id: I6cc851554e2dcc620bfeb45dc63c9d80d09e9586
Merge "update requires to prevent version cap"