PeerFinder fixes:
* Fix split horizon using recent address cache
* Change message tuning parameters to reduce dead messages
* Improved handout algorithm for addresses
* Faster autoconnection strategy
* Consolidate deadline timers
* Send empty endpoints message as a socket ping

r 87d3db9 Fix PeerFinder split horizon with recent addr cache
f e6f1bd8 [WIP] Peerfinder consolidate timers, faster autoconnect
f 444338e [FOLD] handout logic
f 4e7bb48 [FOLD] handout logic
f 3c9b3b8 [FOLD] handout work

Fix PeerFinder split horizon with recent addr cache