Description of keystone clients configuration options

Configuration option = Default value	Description
[clients_keystone]
auth_uri =	(StrOpt) Unversioned keystone url in format like http://0.0.0.0:5000.
ca_file = None	(StrOpt) Optional CA cert file to use in SSL connections.
cert_file = None	(StrOpt) Optional PEM-formatted certificate chain file.
endpoint_type = None	(StrOpt) Type of endpoint in Identity service catalog to use for communication with the OpenStack service.
insecure = None	(BoolOpt) If set, then the server's certificate will not be verified.
key_file = None	(StrOpt) Optional PEM-formatted file that contains the private key.