== sanity test 413k: QoS mkdir exclude prefixes ========== 07:09:54 (1789988994)
lmv.lustre-clilmv-ffff96ae3177b800.qos_exclude_prefixes=+abc:123:foo bar
lmv.lustre-clilmv-ffff96ae3177b800.qos_exclude_prefixes=-abc:123:foo bar
lmv.lustre-clilmv-ffff96ae3177b800.qos_exclude_prefixes=_temporary