Add IP address to peer error messages.
Add IP address to peer error messages.

Closes #102.

Stash-Crypto/btcd,mathiasrw/btcd,Evil-Coin/Evil,aakselrod/btcd,jrick/dcrd,ppcsuite/ppcd,davecgh/btcd,danoctavian/btcd,Cleawing/btcd,Dirbaio/btcd,jongillham/btcd,FactomProject/btcd,BitGo/prova,Roasbeef/btcd,CryptocurrencyCabal/htcd,DanielKrawisz/btcd,ppcsuite/ppcd-old,qchain/btcd,dan-da/btcd,Dirbaio/btcd,qchain/btcd,hectorj/btcd,ppcsuite/ppcd-old,wallclockbuilder/btcd,dajohi/btcd,jimmysong/btcd,FactomProject/btcd,Dirbaio/btcd,decred/dcrd,stevenroose/btcd,decred/dcrd,tb00/btcd,adiabat/btcd,jcmincke/dcrd,aakselrod/btcd,Evil-Coin/Evil,soapboxsys/ombfullnode,sysbot/btcd,cqswxj2013/btcd,DanielKrawisz/btcd,tb00/btcd,mathiasrw/btcd,1d4Nf6/btcd,jcmincke/dcrd,dan-da/btcd,glv2/ppcd,toddfries/btcd,btcsuite/btcd,Stash-Crypto/btcd,btcsuite/btcd,ltcsuite/ltcd,jrick/btcd,cjepson/btcd,stevenroose/btcd,1d4Nf6/btcd,jrick/btcd,dajohi/btcd,sysbot/btcd,jrick/btcd,hectorj/btcd,danoctavian/btcd,cjepson/btcd,jrick/dcrd,davecgh/btcd,glv2/ppcd,pkothbauer/btcd,Cleawing/btcd,btcsuitereleases/btcd,btcsuitereleases/btcd,runeaune/btcd,wallclockbuilder/btcd,CryptocurrencyCabal/htcd,pkothbauer/btcd,jimmysong/btcd,cqswxj2013/btcd,ltcsuite/ltcd,Roasbeef/btcd,BitGo/prova,soapboxsys/ombfullnode,dajohi/btcd,adiabat/btcd,toddfries/btcd,runeaune/btcd,ppcsuite/ppcd,jongillham/btcd,jcmincke/dcrd