restructure inventory and add role to create dns records

all.yml

group_vars/ffspveguests/dns_records_vault

group_vars/ffspveguests/users

inventory/backbone

inventory/boxes

inventory/external_vm

inventory/ffs05

inventory/ffs07

inventory/ffs08

inventory/ffs09

inventory/ffs10

inventory/ffs11

inventory/ffs12

inventory/ffs13

inventory/ffs14

inventory/ffspveguests

inventory/hetzner

inventory/role_backbone_babel

inventory/role_dhcpserver

inventory/role_dns_primary