Description of problem: The tuskar client does not support the --os-cacert parameter, which means a self-signed CA cannot be provided when talking to an endpoint secured by a self-signed certificate.


Version-Release number of selected component (if applicable):


How reproducible: Always


Steps to Reproduce:
1. Configure Keystone to use SSL
2. Attempt to use tuskarclient.  It will fail with the ssl error below.
3.

Actual results:

Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/tuskarclient/shell.py", line 245, in main
    TuskarShell(sys.argv[1:]).run()
  File "/usr/lib/python2.7/site-packages/tuskarclient/shell.py", line 75, in run
    args.func(tuskar_client, args)
  File "/usr/lib/python2.7/site-packages/tuskarclient/v2/roles_shell.py", line 22, in do_role_list
    roles = tuskar.roles.list()
  File "/usr/lib/python2.7/site-packages/tuskarclient/v2/roles.py", line 47, in list
    return self._list(self._path())
  File "/usr/lib/python2.7/site-packages/tuskarclient/openstack/common/apiclient/base.py", line 131, in _list
    body = self.client.get(url).json()
  File "/usr/lib/python2.7/site-packages/tuskarclient/openstack/common/apiclient/client.py", line 355, in get
    return self.client_request("GET", url, **kwargs)
  File "/usr/lib/python2.7/site-packages/tuskarclient/openstack/common/apiclient/client.py", line 345, in client_request
    self, method, url, **kwargs)
  File "/usr/lib/python2.7/site-packages/tuskarclient/openstack/common/apiclient/client.py", line 244, in client_request
    self.authenticate()
  File "/usr/lib/python2.7/site-packages/tuskarclient/openstack/common/apiclient/client.py", line 315, in authenticate
    self.auth_plugin.authenticate(self)
  File "/usr/lib/python2.7/site-packages/tuskarclient/openstack/common/apiclient/auth.py", line 203, in authenticate
    self._do_authenticate(http_client)
  File "/usr/lib/python2.7/site-packages/tuskarclient/common/auth.py", line 39, in _do_authenticate
    self._ksclient = ksclient.Client(**ks_kwargs)
  File "/usr/lib/python2.7/site-packages/keystoneclient/v2_0/client.py", line 152, in __init__
    self.authenticate()
  File "/usr/lib/python2.7/site-packages/keystoneclient/utils.py", line 318, in inner
    return func(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/keystoneclient/httpclient.py", line 503, in authenticate
    resp = self.get_raw_token_from_identity_service(**kwargs)
  File "/usr/lib/python2.7/site-packages/keystoneclient/v2_0/client.py", line 196, in get_raw_token_from_identity_service
    _("Authorization Failed: %s") % e)
AuthorizationFailure: Authorization Failed: SSL exception connecting to https://192.0.2.2:13000/v2.0/tokens: [Errno 1] _ssl.c:504: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed


Expected results: A successful command call.


Additional info: