Enhanced onos-log and onos-check-logs to work against instance specific logs when an optional second argument is given, e.g. onos-log $OC1 c0
diff --git a/tools/test/bin/onos-log b/tools/test/bin/onos-log
index 4dc77c0..c9748a0 100755
--- a/tools/test/bin/onos-log
+++ b/tools/test/bin/onos-log
@@ -7,8 +7,11 @@
 . $ONOS_ROOT/tools/build/envDefaults
 
 remote=$ONOS_USER@${1:-$OCI}
+instance=$2
 
-LOG=$ONOS_INSTALL_DIR/log/karaf.log
+[ -n "$instance" ] && \
+    LOG=$ONOS_INSTALL_DIR/$KARAF_DIST/instances/$instance/data/log/karaf.log || \
+    LOG=$ONOS_INSTALL_DIR/log/karaf.log
 
 trap "ssh $remote 'ps -ef | grep \"tail -n 512\" | grep -v grep | cut -c10-15 | xargs kill'" EXIT