remove _commit_now()
move _remove_own_address_from_candidates() into wan_address_vote() as inline
move convert_packet_to_meta_message() into log_packet() as inline
remove unused imports
Trigger on_success() after iterating over all the received keys and
delayed keys
remove unneeded except clasuses
Merge pull request #273 from LipuFei/cleanup

small cleanup
Merge pull request #274 from whirm/twisted-callback

Trigger on_success() after iterating over all the received keys and delayed keys