== sanity test 413k: QoS mkdir exclude prefixes ========== 11:10:20 (1790781020)
lmv.lustre-clilmv-ffff91d16d35c800.qos_exclude_prefixes=+abc:123:foo bar
lmv.lustre-clilmv-ffff91d16d35c800.qos_exclude_prefixes=-abc:123:foo bar
lmv.lustre-clilmv-ffff91d16d35c800.qos_exclude_prefixes=_temporary