== sanity test 413k: QoS mkdir exclude prefixes ========== 12:40:01 (1788885601)
lmv.lustre-clilmv-ffff987fc6822800.qos_exclude_prefixes=+abc:123:foo bar
lmv.lustre-clilmv-ffff987fc6822800.qos_exclude_prefixes=-abc:123:foo bar
lmv.lustre-clilmv-ffff987fc6822800.qos_exclude_prefixes=_temporary