net: Log to net category for exceptions in ProcessMessages
net: Log to net category for exceptions in ProcessMessages

Remove the forest of special exceptions, and simply log a short
message to the NET logging category when an exception happens during
packet processing. It is not good to panick end users with errors
that any peer can generate (let alone writing to stderr).

jamesob/bitcoin,jonasschnelli/bitcoin,domob1812/namecore,midnightmagic/bitcoin,rnicoll/dogecoin,cdecker/bitcoin,rnicoll/bitcoin,vertcoin/vertcoin,mitchellcash/bitcoin,MarcoFalke/bitcoin,apoelstra/bitcoin,ajtowns/bitcoin,cdecker/bitcoin,fanquake/bitcoin,n1bor/bitcoin,litecoin-project/litecoin,kallewoof/bitcoin,jlopp/statoshi,ahmedbodi/vertcoin,fujicoin/fujicoin,practicalswift/bitcoin,anditto/bitcoin,n1bor/bitcoin,midnightmagic/bitcoin,namecoin/namecoin-core,fanquake/bitcoin,domob1812/namecore,jambolo/bitcoin,andreaskern/bitcoin,instagibbs/bitcoin,tecnovert/particl-core,rnicoll/dogecoin,bitcoin/bitcoin,lateminer/bitcoin,domob1812/bitcoin,particl/particl-core,peercoin/peercoin,yenliangl/bitcoin,gjhiggins/vcoincore,jnewbery/bitcoin,ElementsProject/elements,gjhiggins/vcoincore,anditto/bitcoin,EthanHeilman/bitcoin,practicalswift/bitcoin,jambolo/bitcoin,apoelstra/bitcoin,midnightmagic/bitcoin,kallewoof/bitcoin,sstone/bitcoin,DigitalPandacoin/pandacoin,Xekyo/bitcoin,mm-s/bitcoin,MeshCollider/bitcoin,namecoin/namecore,pstratem/bitcoin,mitchellcash/bitcoin,jambolo/bitcoin,cdecker/bitcoin,namecoin/namecoin-core,Xekyo/bitcoin,JeremyRubin/bitcoin,monacoinproject/monacoin,apoelstra/bitcoin,rnicoll/bitcoin,alecalve/bitcoin,MeshCollider/bitcoin,dscotese/bitcoin,Sjors/bitcoin,litecoin-project/litecoin,jlopp/statoshi,jnewbery/bitcoin,mm-s/bitcoin,bitcoinsSG/bitcoin,fujicoin/fujicoin,Sjors/bitcoin,AkioNak/bitcoin,ElementsProject/elements,GroestlCoin/bitcoin,ajtowns/bitcoin,peercoin/peercoin,DigitalPandacoin/pandacoin,mm-s/bitcoin,qtumproject/qtum,midnightmagic/bitcoin,mitchellcash/bitcoin,domob1812/bitcoin,ElementsProject/elements,domob1812/bitcoin,GroestlCoin/GroestlCoin,alecalve/bitcoin,jlopp/statoshi,JeremyRubin/bitcoin,MarcoFalke/bitcoin,AkioNak/bitcoin,ahmedbodi/vertcoin,bitcoinknots/bitcoin,monacoinproject/monacoin,bitcoinknots/bitcoin,litecoin-project/litecoin,DigitalPandacoin/pandacoin,jamesob/bitcoin,pataquets/namecoin-core,gjhiggins/vcoincore,dscotese/bitcoin,domob1812/namecore,domob1812/bitcoin,mm-s/bitcoin,bitcoin/bitcoin,instagibbs/bitcoin,rnicoll/bitcoin,practicalswift/bitcoin,alecalve/bitcoin,sstone/bitcoin,EthanHeilman/bitcoin,GroestlCoin/bitcoin,ElementsProject/elements,kallewoof/bitcoin,MarcoFalke/bitcoin,n1bor/bitcoin,kallewoof/bitcoin,peercoin/peercoin,qtumproject/qtum,sipsorcery/bitcoin,fanquake/bitcoin,qtumproject/qtum,Sjors/bitcoin,pataquets/namecoin-core,namecoin/namecoin-core,MarcoFalke/bitcoin,GroestlCoin/GroestlCoin,rnicoll/bitcoin,anditto/bitcoin,sstone/bitcoin,fanquake/bitcoin,sstone/bitcoin,alecalve/bitcoin,GroestlCoin/bitcoin,Xekyo/bitcoin,fujicoin/fujicoin,mruddy/bitcoin,ahmedbodi/vertcoin,MeshCollider/bitcoin,kallewoof/bitcoin,anditto/bitcoin,alecalve/bitcoin,sstone/bitcoin,mruddy/bitcoin,instagibbs/bitcoin,ajtowns/bitcoin,jamesob/bitcoin,tecnovert/particl-core,pstratem/bitcoin,ajtowns/bitcoin,GroestlCoin/bitcoin,sstone/bitcoin,prusnak/bitcoin,alecalve/bitcoin,gjhiggins/vcoincore,apoelstra/bitcoin,fanquake/bitcoin,midnightmagic/bitcoin,rnicoll/bitcoin,bitcoinsSG/bitcoin,anditto/bitcoin,sipsorcery/bitcoin,pstratem/bitcoin,domob1812/bitcoin,particl/particl-core,JeremyRubin/bitcoin,MeshCollider/bitcoin,namecoin/namecoin-core,prusnak/bitcoin,ahmedbodi/vertcoin,rnicoll/bitcoin,sipsorcery/bitcoin,mruddy/bitcoin,achow101/bitcoin,JeremyRubin/bitcoin,monacoinproject/monacoin,jamesob/bitcoin,jonasschnelli/bitcoin,bitcoinknots/bitcoin,fanquake/bitcoin,achow101/bitcoin,pataquets/namecoin-core,qtumproject/qtum,rnicoll/dogecoin,mruddy/bitcoin,mitchellcash/bitcoin,bitcoin/bitcoin,jlopp/statoshi,vertcoin/vertcoin,bitcoinsSG/bitcoin,n1bor/bitcoin,Xekyo/bitcoin,jlopp/statoshi,andreaskern/bitcoin,achow101/bitcoin,Sjors/bitcoin,jamesob/bitcoin,jnewbery/bitcoin,GroestlCoin/GroestlCoin,GroestlCoin/GroestlCoin,lateminer/bitcoin,prusnak/bitcoin,andreaskern/bitcoin,mm-s/bitcoin,Xekyo/bitcoin,jambolo/bitcoin,ahmedbodi/vertcoin,pataquets/namecoin-core,namecoin/namecore,monacoinproject/monacoin,mm-s/bitcoin,bitcoinsSG/bitcoin,mitchellcash/bitcoin,EthanHeilman/bitcoin,sipsorcery/bitcoin,prusnak/bitcoin,achow101/bitcoin,pstratem/bitcoin,Sjors/bitcoin,fujicoin/fujicoin,andreaskern/bitcoin,litecoin-project/litecoin,instagibbs/bitcoin,GroestlCoin/bitcoin,namecoin/namecore,EthanHeilman/bitcoin,prusnak/bitcoin,vertcoin/vertcoin,apoelstra/bitcoin,monacoinproject/monacoin,bitcoin/bitcoin,particl/particl-core,cdecker/bitcoin,namecoin/namecore,bitcoinknots/bitcoin,jlopp/statoshi,dscotese/bitcoin,andreaskern/bitcoin,practicalswift/bitcoin,peercoin/peercoin,qtumproject/qtum,jnewbery/bitcoin,DigitalPandacoin/pandacoin,tecnovert/particl-core,practicalswift/bitcoin,MeshCollider/bitcoin,n1bor/bitcoin,bitcoinsSG/bitcoin,vertcoin/vertcoin,jonasschnelli/bitcoin,DigitalPandacoin/pandacoin,JeremyRubin/bitcoin,anditto/bitcoin,AkioNak/bitcoin,JeremyRubin/bitcoin,domob1812/namecore,pataquets/namecoin-core,yenliangl/bitcoin,vertcoin/vertcoin,bitcoinknots/bitcoin,MarcoFalke/bitcoin,particl/particl-core,dscotese/bitcoin,ajtowns/bitcoin,vertcoin/vertcoin,peercoin/peercoin,jonasschnelli/bitcoin,domob1812/bitcoin,bitcoinsSG/bitcoin,Xekyo/bitcoin,mruddy/bitcoin,dscotese/bitcoin,MarcoFalke/bitcoin,practicalswift/bitcoin,MeshCollider/bitcoin,lateminer/bitcoin,tecnovert/particl-core,namecoin/namecoin-core,jonasschnelli/bitcoin,GroestlCoin/GroestlCoin,mruddy/bitcoin,particl/particl-core,ajtowns/bitcoin,sipsorcery/bitcoin,DigitalPandacoin/pandacoin,namecoin/namecoin-core,jamesob/bitcoin,namecoin/namecore,tecnovert/particl-core,AkioNak/bitcoin,yenliangl/bitcoin,gjhiggins/vcoincore,lateminer/bitcoin,lateminer/bitcoin,monacoinproject/monacoin,domob1812/namecore,jambolo/bitcoin,AkioNak/bitcoin,bitcoin/bitcoin,jnewbery/bitcoin,litecoin-project/litecoin,midnightmagic/bitcoin,GroestlCoin/bitcoin,instagibbs/bitcoin,gjhiggins/vcoincore,achow101/bitcoin,lateminer/bitcoin,bitcoin/bitcoin,tecnovert/particl-core,jambolo/bitcoin,kallewoof/bitcoin,yenliangl/bitcoin,pataquets/namecoin-core,yenliangl/bitcoin,ahmedbodi/vertcoin,EthanHeilman/bitcoin,GroestlCoin/GroestlCoin,ElementsProject/elements,EthanHeilman/bitcoin,prusnak/bitcoin,qtumproject/qtum,rnicoll/dogecoin,apoelstra/bitcoin,fujicoin/fujicoin,cdecker/bitcoin,pstratem/bitcoin,dscotese/bitcoin,qtumproject/qtum,ElementsProject/elements,pstratem/bitcoin,instagibbs/bitcoin,sipsorcery/bitcoin,fujicoin/fujicoin,n1bor/bitcoin,mitchellcash/bitcoin,AkioNak/bitcoin,litecoin-project/litecoin,namecoin/namecore,andreaskern/bitcoin,domob1812/namecore,peercoin/peercoin,achow101/bitcoin,yenliangl/bitcoin,cdecker/bitcoin,particl/particl-core,rnicoll/dogecoin