Don't fail llog test if no MDS is available on the client.

lustre/tests/run-llog.sh

 #!/bin/bash
 PATH=`dirname $0`:`dirname $0`/../utils:$PATH
 TMP=${TMP:-/tmp}
+
+MDS=`ls /proc/fs/lustre/mds | grep -v num_refs | head -1`
+[ -z "$MDS" ] && echo "no MDS available, skipping llog test" && exit 0
+
 insmod ../obdclass/llog_test.o || exit 1
 lctl modules > $TMP/ogdb-`hostname`
 echo "NOW reload debugging syms.."
@@ -9,7 +13,7 @@ RC=0
 lctl <<EOT || RC=2
 newdev
 attach llog_test llt_name llt_uuid
-setup mds1
+setup $MDS
 EOT
 
 # Using ignore_errors will allow lctl to cleanup even if the test fails.