Import Ubuntu 12.04 stock /etc/default/dnsmasq

For later modification.
Expose IGNORE_RESOLVECONF param in Debian SysV

This tells dnsmasq to ignore the resolvconf hooks and read the resulting
`/etc/resolv.conf` directly instead. It should poll for changes.
Prevent ::client and ::server on same node

The two configurations are conflicting. Although there might be some room to
more common options to a single file/class.
Don't parse /etc/hosts for dnsmasq::server

This can resulting in conflicting A records for the server. Especially if it
has more than one interface. Treat `addn-hosts` as the source of truth
instead.