Updated openstack/openstack
Project: openstack/python-neutronclient  f6eba87aa1761de2425d4651a62e3d07d88de3fe

Remove httplib2 requirement

There are no imports from httplib2 and everything seems to be converted
over to using the requests library now, so remove the extraneous
dependency.

Change-Id: I6a2a9543ea8f5da29494e1dba7659ec02a43deea