test: Update fwd.sh to ignore kernel logs

With the new support for /dev/kmsg the tests can run on a system that
already has a syslog daemon, and still receive all kernel messages.  We
want to ignore those in this (all?) tests and focus on the forwarding of
messages between two sysklogd.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

test/fwd.sh

@@ -13,7 +13,8 @@ ntp.*	@127.0.0.2:${PORT2}	;RFC5424
 EOF
 
 cat <<EOF >${CONFD2}/50-default.conf
-*.*	${LOG2}			;RFC5424
+kern.*		/dev/null
+*.*;kern.none	${LOG2}		;RFC5424
 EOF
 
 ../src/syslogd -a 127.0.0.2:* -b :${PORT2} -d -F -f ${CONF2} -p ${SOCK2} -m1 &