bug fix.
modify some return value for new added command.
bug fix:
  when a bucket is marked as transfer_out, cannot transfered by another client who's marked as transfer_in status when the bucket's status is not right. the same for transfer_in case.
add 3 new command:  rctranstat/rcgetlockingkey/rcresetbuckets
fix bug:  fix bug when run rclockingkeys crash.