== sanity test 413k: QoS mkdir exclude prefixes ========== 06:44:10 (1789641850)
lmv.lustre-clilmv-ffff9681ec799800.qos_exclude_prefixes=+abc:123:foo bar
lmv.lustre-clilmv-ffff9681ec799800.qos_exclude_prefixes=-abc:123:foo bar
lmv.lustre-clilmv-ffff9681ec799800.qos_exclude_prefixes=_temporary