t/mcdbctl.t - rename cdb to mcdb for clarity
t/mcdbctl.t - rename cdb to mcdb for clarity

t/mcdbctl.t - rename cdb to mcdb for clarity
(had previously left as "cdb" for ease of diff with djb rts.sh,
 but many tests have now been modified for mcdbctl)

gstrauss/mcdb,gstrauss/mcdb,gstrauss/mcdb,gstrauss/mcdb,gstrauss/mcdb