return value of handle_message for MSG_OSD_SUBOP/MSG_OSD_SUBOPREPLY should be true

if the return value is true , it will skip unnecessary checks

Signed-off-by: xinxin shu <xinxin.shu@intel.com>
Merge pull request #2705 from xinxinsh/master

return value of handle_message for MSG_OSD_SUBOP/MSG_OSD_SUBOPREPLY shou...

Reviewed-by: Sage Weil <sage@redhat.com>