-AT_CHECK([ovs-appctl -t ovsdb-server ovsdb-server/add-db db2], 2, [], [stderr])
-AT_CHECK([sed 's/(.*)/(...)/' stderr], [0],
- [I/O error: db2: failed to lock lockfile (...)
+AT_CHECK([ovs-appctl -t ovsdb-server ovsdb-server/add-db db2], 2, [],
+ [db2: already open