fixed test plan for 056-flush.t for the "check leak" testing mode.
fixed test plan for 056-flush.t for the "check leak" testing mode.

yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx