check: log running test to dmesg

We already log the running test to system logs via "logger"
but viro pointed out that we can use /dev/kmsg to insert it
into dmesg as well.  When looking at the serial console that
could be pretty useful.

Thanks to viro for the test -w suggestion too.

[Eryu Guan adds timestamp to dmesg too]

Signed-off-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

check

@@ -561,6 +561,10 @@ for section in $HOST_OPTIONS_SECTIONS; do
 		$timestamp && echo -n "	["`date "+%T"`"]"
 		[ ! -x $seq ] && chmod u+x $seq # ensure we can run it
 		$LOGGER_PROG "run xfstest $seqnum"
+		if [ -w /dev/kmsg ]; then
+			date_time=`date +"%F %T"`
+			echo "run fstests $seqnum at $date_time" > /dev/kmsg
+		fi
 		./$seq >$tmp.rawout 2>&1
 		sts=$?
 		$timestamp && _timestamp