Workaround for sporadic failures

Change-Id: I3d567d976cd6b2ddb376378e3fd5b778754f3887
diff --git a/tools/build/onos-build b/tools/build/onos-build
index 99a48a4..b3ff8d4 100755
--- a/tools/build/onos-build
+++ b/tools/build/onos-build
@@ -4,4 +4,4 @@
 # -----------------------------------------------------------------------------
 
 [ ! -d "$ONOS_ROOT" ] && echo "ONOS_ROOT is not defined" >&2 && exit 1
-cd $ONOS_ROOT && onos-buck build onos && onos-buck test
+cd $ONOS_ROOT && onos-buck build onos && onos-buck test --only-failing