dnsmasq: remove example domains from rfc6761.conf (FS#1447)

dnsmasq: remove example domains from rfc6761.conf (FS#1447)

RFC6771 does not exclude the forwarding of the example domain as it
states : "Caching DNS servers SHOULD NOT recognize example names as
special and SHOULD resolve them normally."
Example domains cannot be assigned to any user or person by DNS
registrars as they're registered in perpetuity to IANA meaning
they can be resolved; therefore let's remove the example domains
from the rfc6761.conf file.

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>