Change cfg.set_defaults into cors.set_defaults
Change cfg.set_defaults into cors.set_defaults

Cors has added set_deafults method, just use it.
Related link:
https://review.openstack.org/#/c/285368/

Change-Id: Iff525532bb4f8f53d1c9e00b873b4066b0315178

rajalokan/keystone,mahak/keystone,ilay09/keystone,rajalokan/keystone,openstack/keystone,ilay09/keystone,mahak/keystone,ilay09/keystone,openstack/keystone,mahak/keystone,openstack/keystone,rajalokan/keystone