In the <dns/> section of network configuration users can set up
forwarding of DNS requests to custom DNS servers. These are
specified using 'addr' attribute. But configuring port wasn't
possible, until now. New 'port' attribute is introduced, which
allows overriding the default DNS port for given address.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Laine Stump <laine@redhat.com>