== sanity test 413k: QoS mkdir exclude prefixes ========== 00:43:39 (1789361019)
lmv.lustre-clilmv-ffff994d44d90000.qos_exclude_prefixes=+abc:123:foo bar
lmv.lustre-clilmv-ffff994d44d90000.qos_exclude_prefixes=-abc:123:foo bar
lmv.lustre-clilmv-ffff994d44d90000.qos_exclude_prefixes=_temporary