[commands] use --os-auth-type token only for python-openstackclient
[commands] use --os-auth-type token only for python-openstackclient

After the merge of I14c9479ef7ded7b7c62b0d976706e3d7e26a6cd6 the
additional parameter --os-auth-type token is used for every client. This
is wrong, the additonal parameter should only be used when generating
documentation for the python-openstackclient.

Change-Id: I801637691bfd4298859ee539c5adaf0943330836

openstack/openstack-doc-tools,savinash47/openstack-doc-tools,openstack/openstack-doc-tools,savinash47/openstack-doc-tools,savinash47/openstack-doc-tools