newer versions of ifupdown2 try to set the addrgen mode for interfaces
using inet6 but it seems that wireguard interfaces do not support this.
This causes a "ip link set dev <iface> down" command during every
execution of ifreload as the default mode eui6 does not mach the mode
set on the interface which is none.
* add jinja2 extension 'jinja2.ext.do' to ansible.cfg
* add host kichererbse.freifunk-mwu.de
* add new server_type 'mesh-service' and new host group 'ffmwu-mesh-services'
* use new loopback and anycast networks
* add role wireguard
* add role wireguard as dependency for roles network-routing + service-bird
* add playbook 'mesh-services'
