neoraider suggested that I change my own config to batman-adv-15, so therefore we should change the example.
he said that batman-adv-15 is stable enough now, so why not go with something more stable and newer. :D
- generalize, to make it more clear that the site config
needs to be adapted to the local community.
- remove some host names and public keys used in Lübeck
- suggest private space mac adresses
- change fastd method to salsa2012+umac, which is the recommended default
- add config for a fastd peer reachable by both ipv4 and ipv6
- order GLUON_SITE_PACKAGES alphabetically
