In baymodel (https://github.com/openstack/magnum/blob/master/magnum/
api/controllers/v1/baymodel.py), we have an unset exception list:
baymodel.unset_fields_except(['uuid', 'name', 'image_id',
'apiserver_port', 'coe'])
In order for the new "--fields" option [1] to work better, this patch will
remove the expand option so that all fields are included by default.
[1] https://review.openstack.org/#/c/286950/
Change-Id: I1adffca9a7c6e013bed38530036dfc0aed918fdc
Closes-Bug: #1579236