== sanity test 413k: QoS mkdir exclude prefixes ========== 12:48:02 (1780332482)
lmv.lustre-clilmv-ffff9329d092a800.qos_exclude_prefixes=+abc:123:foo bar
lmv.lustre-clilmv-ffff9329d092a800.qos_exclude_prefixes=-abc:123:foo bar
lmv.lustre-clilmv-ffff9329d092a800.qos_exclude_prefixes=_temporary