service: stop supporting deprecated group for auth option
service: stop supporting deprecated group for auth option

This was already deprecated back in Ceilometer, so we can remove it from
there.

Change-Id: I0d29c86fe6d8b2a60c214e0c44534973f7dd25b4

pczerkas/aodh,sileht/aodh,openstack/aodh,pczerkas/aodh,sileht/aodh,openstack/aodh