Configure region for trust actions

The config we want is: [connection] ipv6.addr-gen-mode=0

ref https://gitlab.cern.ch/kubernetes/project/-/issues/758

ref #58 (closed)

ref https://gitlab.cern.ch/kubernetes/automation/releases/kops-openstack/-/issues/71

Signed-off-by: Spyros Trigazis spyridon.trigazis@cern.ch