allow 'vxlan' as a choice for the 'networkingmode' parameter
allow 'vxlan' as a choice for the 'networkingmode' parameter

This is a valid choice and is expected by cloud-mkcloud6-ha-trigger.

vmoravec/automation,aspiers/automation,gosipyan/automation,vmoravec/automation,aspiers/automation,SUSE-Cloud/automation,gosipyan/automation,gosipyan/automation,aspiers/automation,SUSE-Cloud/automation,vmoravec/automation,SUSE-Cloud/automation,aspiers/automation,SUSE-Cloud/automation,gosipyan/automation,vmoravec/automation