ensure all keystone conf is read from config file
ensure all keystone conf is read from config file

 - part of keystone_authtoken is not available under the GroupAttr
 - we fetch it from _namespace in the conf

Change-Id: Ibbc738ee4c90392af47f1b6d69aee3c8dbbf3c17

openstack/networking-bigswitch,stackforge/networking-bigswitch,wolverineav/networking-bigswitch,openstack/networking-bigswitch,wolverineav/networking-bigswitch,stackforge/networking-bigswitch