Add a terminal / to the quantum endpoint in keystone for correcting the tempest test network requests

  File "/usr/lib/python2.7/dist-packages/httplib2/__init__.py", line 760, in __init__
    httplib.HTTPConnection.__init__(self, host, port, strict)
  File "/usr/lib/python2.7/httplib.py", line 693, in __init__
    self._set_hostport(host, port)
  File "/usr/lib/python2.7/httplib.py", line 721, in _set_hostport
    raise InvalidURL("nonnumeric port: '%s'" % host[i+1:])
InvalidURL: nonnumeric port: '9696v2.0'