== sanity test 413k: QoS mkdir exclude prefixes ========== 23:42:09 (1781235729)
lmv.lustre-clilmv-ffff9de75818a800.qos_exclude_prefixes=+abc:123:foo bar
lmv.lustre-clilmv-ffff9de75818a800.qos_exclude_prefixes=-abc:123:foo bar
lmv.lustre-clilmv-ffff9de75818a800.qos_exclude_prefixes=_temporary