bitcoin/bitcoin — pull request #4632 by jgarzik (2014-08-04 19:20:08+00:00)
Title: addrman: Do not propagate obviously poor addresses onto the network

This is a first pass at filtering bad addresses.

An improvement would ensure that the target number of addresses was
returned. In a situation with lots of bad addresses, this change might
return zero, when it hits a patch of bad addresses.