The placement options os_region_name and os_interface
is removed as of Rocky [1].
This removes the already deprecated os_region_name parameter
and users should use the region_name parameter instead.
It also deprecates the os_interface parameter and users should
use the valid_interfaces parameter instead. The configuration file is
changed so that the placement/valid_interfaces option is set instead
of os_interface since that one does not have any effect.
[1] https://docs.openstack.org/releasenotes/nova/rocky.html
Change-Id: I13201f8edf5d0ef87c6a4d90d3726ae7f1c2c300
b1181f6242