== sanity test 413k: QoS mkdir exclude prefixes ========== 06:36:24 (1787826984)
lmv.lustre-clilmv-ffff904691bfe000.qos_exclude_prefixes=+abc:123:foo bar
lmv.lustre-clilmv-ffff904691bfe000.qos_exclude_prefixes=-abc:123:foo bar
lmv.lustre-clilmv-ffff904691bfe000.qos_exclude_prefixes=_temporary