KSA adapter options have been registered but these have been unused.
Fix the ignored adapter options so that a few important options such
as valid_interfaces work.
Note that we can't use the native oslo_conf argument because
the current behavior of Connection class attempts to load these adapter
options from the "keystone" section, while there are actually
registered in "oslo_limits" section.
This effectively reverts 4a3c10b58e
because the same functionality can be now achieved by
the valid_interface option.
Related-Bug: 2105987
Change-Id: I038b805be85b9b16c8a1a9eeaa1c90f8f413cc97
f351266cba