Fix bad peer looping
Fix bad peer looping

JWU42 pointed out an issue where peer discovery could get in a
failure loop for bad peers; this fixes the the root cause and
the immediate retries

Groestlcoin/electrumx-grs,erasmospunk/electrumx,Crowndev/electrumx,shsmith/electrumx,shsmith/electrumx,thelazier/electrumx,bauerj/electrumx,Crowndev/electrumx,bauerj/electrumx,Groestlcoin/electrumx-grs,thelazier/electrumx,erasmospunk/electrumx