Added IPv6 Germany (bsd.ipv6.uni-erlangen.de).

Note: the hostname bsd.ipv6.uni-erlangen.de has only a IPv6 address.
It is the same maschine as www2.de.freebsd.org aka
freebsd.rrze.uni-erlangen.de.

Submitted by: Falko Dressler <fd@bsd.rrze.uni-erlangen.de>