* add total_diff to ping/pong msgs
debug log for total_diff on each ping/pong
* expose peer addr to the handle_payload fn
so we know where it came from
* fix p2p tests for ping
* default to 0 if we cannot read total_difficulty
* updating a connected peer in place
* actually update peer info diff
* fixup p2p tests
AntiochP
6352dfbac9