== sanity test 413k: QoS mkdir exclude prefixes ========== 03:04:50 (1789023890)
lmv.lustre-clilmv-ffff962eb3030800.qos_exclude_prefixes=+abc:123:foo bar
lmv.lustre-clilmv-ffff962eb3030800.qos_exclude_prefixes=-abc:123:foo bar
lmv.lustre-clilmv-ffff962eb3030800.qos_exclude_prefixes=_temporary