Remove NOTFOUND transactions from in-flight data structures
Remove NOTFOUND transactions from in-flight data structures

This prevents a bug where the in-flight queue for our peers will not be
drained, resulting in not downloading any new transactions from our peers.

Thanks to ajtowns for reporting this bug.

alecalve/bitcoin,gjhiggins/vcoincore,wellenreiter01/Feathercoin,wellenreiter01/Feathercoin,tecnovert/particl-core,domob1812/namecore,MarcoFalke/bitcoin,mm-s/bitcoin,achow101/bitcoin,jambolo/bitcoin,jlopp/statoshi,sipsorcery/bitcoin,GroestlCoin/bitcoin,jlopp/statoshi,wellenreiter01/Feathercoin,n1bor/bitcoin,instagibbs/bitcoin,midnightmagic/bitcoin,kallewoof/bitcoin,vertcoin/vertcoin,jlopp/statoshi,rnicoll/bitcoin,lateminer/bitcoin,bitcoinsSG/bitcoin,namecoin/namecore,qtumproject/qtum,sipsorcery/bitcoin,prusnak/bitcoin,monacoinproject/monacoin,wellenreiter01/Feathercoin,Sjors/bitcoin,alecalve/bitcoin,mitchellcash/bitcoin,jonasschnelli/bitcoin,cdecker/bitcoin,jambolo/bitcoin,cdecker/bitcoin,domob1812/bitcoin,jtimon/bitcoin,jtimon/bitcoin,litecoin-project/litecoin,DigitalPandacoin/pandacoin,mitchellcash/bitcoin,jamesob/bitcoin,andreaskern/bitcoin,jlopp/statoshi,midnightmagic/bitcoin,instagibbs/bitcoin,pstratem/bitcoin,mruddy/bitcoin,lateminer/bitcoin,MeshCollider/bitcoin,rnicoll/bitcoin,vertcoin/vertcoin,GroestlCoin/bitcoin,bitcoinknots/bitcoin,namecoin/namecore,litecoin-project/litecoin,EthanHeilman/bitcoin,tjps/bitcoin,GroestlCoin/bitcoin,mm-s/bitcoin,CryptArc/bitcoin,kallewoof/bitcoin,peercoin/peercoin,GroestlCoin/GroestlCoin,tecnovert/particl-core,achow101/bitcoin,sstone/bitcoin,jamesob/bitcoin,bitcoinknots/bitcoin,Sjors/bitcoin,prusnak/bitcoin,andreaskern/bitcoin,nikkitan/bitcoin,vertcoin/vertcoin,Xekyo/bitcoin,ahmedbodi/vertcoin,n1bor/bitcoin,apoelstra/bitcoin,lateminer/bitcoin,jtimon/bitcoin,qtumproject/qtum,ElementsProject/elements,gjhiggins/vcoincore,practicalswift/bitcoin,ahmedbodi/vertcoin,instagibbs/bitcoin,MarcoFalke/bitcoin,monacoinproject/monacoin,pstratem/bitcoin,ahmedbodi/vertcoin,jtimon/bitcoin,particl/particl-core,bitcoin/bitcoin,rnicoll/bitcoin,alecalve/bitcoin,FeatherCoin/Feathercoin,domob1812/namecore,jambolo/bitcoin,jlopp/statoshi,CryptArc/bitcoin,tjps/bitcoin,lateminer/bitcoin,jtimon/bitcoin,midnightmagic/bitcoin,namecoin/namecore,achow101/bitcoin,namecoin/namecore,jlopp/statoshi,FeatherCoin/Feathercoin,n1bor/bitcoin,particl/particl-core,nikkitan/bitcoin,fanquake/bitcoin,ElementsProject/elements,yenliangl/bitcoin,rnicoll/bitcoin,sstone/bitcoin,fujicoin/fujicoin,DigitalPandacoin/pandacoin,namecoin/namecore,ElementsProject/elements,JeremyRubin/bitcoin,fujicoin/fujicoin,apoelstra/bitcoin,sipsorcery/bitcoin,achow101/bitcoin,cdecker/bitcoin,ajtowns/bitcoin,apoelstra/bitcoin,nikkitan/bitcoin,wellenreiter01/Feathercoin,mm-s/bitcoin,Xekyo/bitcoin,peercoin/peercoin,mruddy/bitcoin,jamesob/bitcoin,tjps/bitcoin,practicalswift/bitcoin,prusnak/bitcoin,pataquets/namecoin-core,mm-s/bitcoin,prusnak/bitcoin,prusnak/bitcoin,sipsorcery/bitcoin,bitcoinknots/bitcoin,dscotese/bitcoin,GroestlCoin/GroestlCoin,bitcoin/bitcoin,AkioNak/bitcoin,fanquake/bitcoin,pstratem/bitcoin,domob1812/namecore,gjhiggins/vcoincore,mitchellcash/bitcoin,JeremyRubin/bitcoin,MarcoFalke/bitcoin,andreaskern/bitcoin,namecoin/namecoin-core,gjhiggins/vcoincore,domob1812/bitcoin,AkioNak/bitcoin,domob1812/namecore,jonasschnelli/bitcoin,qtumproject/qtum,n1bor/bitcoin,vertcoin/vertcoin,mm-s/bitcoin,MarcoFalke/bitcoin,anditto/bitcoin,pataquets/namecoin-core,anditto/bitcoin,tecnovert/particl-core,GroestlCoin/GroestlCoin,FeatherCoin/Feathercoin,qtumproject/qtum,nikkitan/bitcoin,achow101/bitcoin,ElementsProject/elements,Sjors/bitcoin,Xekyo/bitcoin,fanquake/bitcoin,midnightmagic/bitcoin,pataquets/namecoin-core,MarcoFalke/bitcoin,litecoin-project/litecoin,anditto/bitcoin,jonasschnelli/bitcoin,particl/particl-core,DigitalPandacoin/pandacoin,cdecker/bitcoin,andreaskern/bitcoin,jnewbery/bitcoin,midnightmagic/bitcoin,apoelstra/bitcoin,MeshCollider/bitcoin,pstratem/bitcoin,DigitalPandacoin/pandacoin,tjps/bitcoin,mitchellcash/bitcoin,AkioNak/bitcoin,jamesob/bitcoin,rnicoll/bitcoin,kallewoof/bitcoin,namecoin/namecoin-core,sstone/bitcoin,domob1812/namecore,bitcoinsSG/bitcoin,CryptArc/bitcoin,kallewoof/bitcoin,litecoin-project/litecoin,sipsorcery/bitcoin,GroestlCoin/GroestlCoin,gjhiggins/vcoincore,jambolo/bitcoin,AkioNak/bitcoin,bitcoin/bitcoin,bitcoin/bitcoin,fujicoin/fujicoin,mruddy/bitcoin,CryptArc/bitcoin,instagibbs/bitcoin,GroestlCoin/bitcoin,lateminer/bitcoin,kallewoof/bitcoin,nikkitan/bitcoin,EthanHeilman/bitcoin,yenliangl/bitcoin,mruddy/bitcoin,pstratem/bitcoin,monacoinproject/monacoin,fujicoin/fujicoin,bitcoinsSG/bitcoin,yenliangl/bitcoin,ajtowns/bitcoin,GroestlCoin/bitcoin,JeremyRubin/bitcoin,sstone/bitcoin,pataquets/namecoin-core,namecoin/namecoin-core,ajtowns/bitcoin,FeatherCoin/Feathercoin,litecoin-project/litecoin,MarcoFalke/bitcoin,anditto/bitcoin,rnicoll/dogecoin,rnicoll/dogecoin,lateminer/bitcoin,midnightmagic/bitcoin,ElementsProject/elements,DigitalPandacoin/pandacoin,MeshCollider/bitcoin,GroestlCoin/bitcoin,jamesob/bitcoin,peercoin/peercoin,mm-s/bitcoin,yenliangl/bitcoin,sipsorcery/bitcoin,rnicoll/dogecoin,jamesob/bitcoin,anditto/bitcoin,Sjors/bitcoin,bitcoinsSG/bitcoin,particl/particl-core,rnicoll/bitcoin,bitcoin/bitcoin,AkioNak/bitcoin,practicalswift/bitcoin,rnicoll/dogecoin,alecalve/bitcoin,ajtowns/bitcoin,domob1812/bitcoin,qtumproject/qtum,bitcoinsSG/bitcoin,CryptArc/bitcoin,tecnovert/particl-core,litecoin-project/litecoin,jnewbery/bitcoin,andreaskern/bitcoin,MeshCollider/bitcoin,nikkitan/bitcoin,fanquake/bitcoin,jambolo/bitcoin,jnewbery/bitcoin,GroestlCoin/GroestlCoin,fujicoin/fujicoin,kallewoof/bitcoin,JeremyRubin/bitcoin,GroestlCoin/GroestlCoin,Xekyo/bitcoin,bitcoinknots/bitcoin,fanquake/bitcoin,peercoin/peercoin,ajtowns/bitcoin,qtumproject/qtum,monacoinproject/monacoin,domob1812/bitcoin,wellenreiter01/Feathercoin,mruddy/bitcoin,alecalve/bitcoin,alecalve/bitcoin,ahmedbodi/vertcoin,tjps/bitcoin,ElementsProject/elements,jonasschnelli/bitcoin,DigitalPandacoin/pandacoin,ajtowns/bitcoin,achow101/bitcoin,tecnovert/particl-core,apoelstra/bitcoin,domob1812/namecore,practicalswift/bitcoin,FeatherCoin/Feathercoin,yenliangl/bitcoin,instagibbs/bitcoin,monacoinproject/monacoin,qtumproject/qtum,EthanHeilman/bitcoin,mruddy/bitcoin,dscotese/bitcoin,jambolo/bitcoin,jonasschnelli/bitcoin,tecnovert/particl-core,Sjors/bitcoin,FeatherCoin/Feathercoin,n1bor/bitcoin,dscotese/bitcoin,CryptArc/bitcoin,cdecker/bitcoin,particl/particl-core,mitchellcash/bitcoin,anditto/bitcoin,jtimon/bitcoin,domob1812/bitcoin,MeshCollider/bitcoin,bitcoinsSG/bitcoin,fanquake/bitcoin,bitcoin/bitcoin,namecoin/namecoin-core,tjps/bitcoin,sstone/bitcoin,EthanHeilman/bitcoin,namecoin/namecoin-core,bitcoinknots/bitcoin,Xekyo/bitcoin,JeremyRubin/bitcoin,rnicoll/dogecoin,prusnak/bitcoin,practicalswift/bitcoin,ahmedbodi/vertcoin,namecoin/namecoin-core,domob1812/bitcoin,instagibbs/bitcoin,MeshCollider/bitcoin,practicalswift/bitcoin,gjhiggins/vcoincore,fujicoin/fujicoin,pataquets/namecoin-core,dscotese/bitcoin,ahmedbodi/vertcoin,monacoinproject/monacoin,vertcoin/vertcoin,dscotese/bitcoin,peercoin/peercoin,Xekyo/bitcoin,peercoin/peercoin,n1bor/bitcoin,AkioNak/bitcoin,dscotese/bitcoin,yenliangl/bitcoin,mitchellcash/bitcoin,jnewbery/bitcoin,andreaskern/bitcoin,pataquets/namecoin-core,particl/particl-core,namecoin/namecore,vertcoin/vertcoin,EthanHeilman/bitcoin,JeremyRubin/bitcoin,apoelstra/bitcoin,cdecker/bitcoin,sstone/bitcoin,pstratem/bitcoin,EthanHeilman/bitcoin,jnewbery/bitcoin