Remove cap on websocket-client

The new version contains support for Kubernetes core Workloads API.

To update to this version we need to:
a. Remove the cap on websocket-client
b. Alter the constrained version of websocket-client - to be co-installable
with openstack libs (python-zunclient) and kubernetes
c. Raise the minimum acceptable version fro kubernetes - to be compatible
with the wider range of websocket-client

a follow-on commit to do b and c after zuneclient is release will follow

Change-Id: I8f65ca4ffc1cab7a7eb0708884ee311a6aeb0e26
Signed-off-by: Matthew Thode <mthode@mthode.org>

global-requirements.txt

@@ -323,9 +323,7 @@ urllib3>=1.21.1  # MIT
 unicodecsv>=0.8.0;python_version<'3.0'  # BSD
 warlock>=1.2.0,<2  # Apache-2.0
 WebOb>=1.7.1  # MIT
-# upper cap is due to kubernetes, see
-# https://github.com/kubernetes-incubator/client-python/blob/v4.0.0/requirements.txt#L9
-websocket-client>=0.33.0,<=0.40.0  # LGPLv2+
+websocket-client>=0.33.0  # LGPLv2+
 websockify>=0.8.0  # LGPLv3
 wheel>=0.24.0  # MIT
 PyMI>=1.0.0;sys_platform=='win32'  # Apache 2.0 License