The "api_host" and "api_port" options from group "service:api"
have been deprecated in favor of the listen option setting.
The "port" and "host" opitions are same.
Change-Id: Iab54d400ca08bc99a4f634ca7ce3b1996d379c26
Depends-On: https://review.openstack.org/#/c/403967/
Depends-On: https://review.openstack.org/#/c/399941/