tests: Add fuzzing coverage for StringForFeeReason(...)
tests: Add fuzzing coverage for StringForFeeReason(...)

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