Use --compute availability zones.

Created by: garloff

When creating several networks with VMs, we can distribute them into different AZs. Unless overridden by the openstack-health-monitor operator, we should use the --compute AZs for this, not the superset of volume, compute and network azs. Most notably, we may have an overarching network AZ with it's own name and this should not break the auto-detection. Use --volume AZs.

Signed-off-by: Kurt Garloff kurt@garloff.de