Updated openstack/openstack
Project: openstack/neutron  16d07829ca1db9a72bc1375847807fa03940e8fd

metaplugin: use correct parameter to call neutron client

Use region_name instead of auth_region.

Change-Id: Ia4640f282de6d781f4f2d5b35da93afa4a88b6bb
Closes-Bug: 1252982
(cherry picked from commit 86617741bcbe040cc95f1fb733525895725279b3)