test: use f-strings in feature_blocksdir.py
test: use f-strings in feature_blocksdir.py

pataquets/namecoin-core,kallewoof/bitcoin,fujicoin/fujicoin,bitcoinsSG/bitcoin,achow101/bitcoin,yenliangl/bitcoin,sstone/bitcoin,mruddy/bitcoin,jlopp/statoshi,particl/particl-core,MarcoFalke/bitcoin,lateminer/bitcoin,MarcoFalke/bitcoin,domob1812/bitcoin,sipsorcery/bitcoin,yenliangl/bitcoin,mm-s/bitcoin,GroestlCoin/bitcoin,GroestlCoin/GroestlCoin,mm-s/bitcoin,jamesob/bitcoin,anditto/bitcoin,kallewoof/bitcoin,mruddy/bitcoin,bitcoin/bitcoin,lateminer/bitcoin,mruddy/bitcoin,lateminer/bitcoin,tecnovert/particl-core,fujicoin/fujicoin,fanquake/bitcoin,domob1812/bitcoin,bitcoinsSG/bitcoin,ajtowns/bitcoin,domob1812/namecore,prusnak/bitcoin,tecnovert/particl-core,anditto/bitcoin,pataquets/namecoin-core,jlopp/statoshi,jlopp/statoshi,bitcoin/bitcoin,mm-s/bitcoin,tecnovert/particl-core,jamesob/bitcoin,Xekyo/bitcoin,domob1812/bitcoin,sstone/bitcoin,dscotese/bitcoin,domob1812/bitcoin,particl/particl-core,dscotese/bitcoin,bitcoin/bitcoin,instagibbs/bitcoin,namecoin/namecore,achow101/bitcoin,sstone/bitcoin,achow101/bitcoin,AkioNak/bitcoin,andreaskern/bitcoin,anditto/bitcoin,AkioNak/bitcoin,lateminer/bitcoin,bitcoin/bitcoin,dscotese/bitcoin,bitcoinsSG/bitcoin,prusnak/bitcoin,sstone/bitcoin,particl/particl-core,tecnovert/particl-core,sstone/bitcoin,fanquake/bitcoin,sipsorcery/bitcoin,namecoin/namecoin-core,bitcoin/bitcoin,GroestlCoin/GroestlCoin,yenliangl/bitcoin,particl/particl-core,ajtowns/bitcoin,lateminer/bitcoin,pataquets/namecoin-core,bitcoin/bitcoin,prusnak/bitcoin,sipsorcery/bitcoin,dscotese/bitcoin,ajtowns/bitcoin,achow101/bitcoin,AkioNak/bitcoin,domob1812/bitcoin,prusnak/bitcoin,bitcoinknots/bitcoin,andreaskern/bitcoin,jambolo/bitcoin,fujicoin/fujicoin,instagibbs/bitcoin,namecoin/namecore,namecoin/namecoin-core,mruddy/bitcoin,fanquake/bitcoin,bitcoinknots/bitcoin,jamesob/bitcoin,particl/particl-core,kallewoof/bitcoin,GroestlCoin/bitcoin,jamesob/bitcoin,jambolo/bitcoin,Xekyo/bitcoin,Xekyo/bitcoin,MarcoFalke/bitcoin,namecoin/namecoin-core,GroestlCoin/bitcoin,jambolo/bitcoin,Xekyo/bitcoin,MarcoFalke/bitcoin,achow101/bitcoin,prusnak/bitcoin,jambolo/bitcoin,GroestlCoin/GroestlCoin,lateminer/bitcoin,andreaskern/bitcoin,anditto/bitcoin,fanquake/bitcoin,achow101/bitcoin,domob1812/namecore,GroestlCoin/GroestlCoin,jlopp/statoshi,kallewoof/bitcoin,GroestlCoin/bitcoin,jamesob/bitcoin,bitcoinknots/bitcoin,mruddy/bitcoin,jlopp/statoshi,particl/particl-core,jlopp/statoshi,fujicoin/fujicoin,anditto/bitcoin,instagibbs/bitcoin,mruddy/bitcoin,pataquets/namecoin-core,fanquake/bitcoin,bitcoinsSG/bitcoin,AkioNak/bitcoin,jamesob/bitcoin,instagibbs/bitcoin,instagibbs/bitcoin,andreaskern/bitcoin,sipsorcery/bitcoin,dscotese/bitcoin,mm-s/bitcoin,ajtowns/bitcoin,tecnovert/particl-core,pataquets/namecoin-core,fujicoin/fujicoin,namecoin/namecore,ajtowns/bitcoin,namecoin/namecoin-core,bitcoinsSG/bitcoin,bitcoinknots/bitcoin,tecnovert/particl-core,kallewoof/bitcoin,prusnak/bitcoin,anditto/bitcoin,MarcoFalke/bitcoin,sstone/bitcoin,dscotese/bitcoin,sipsorcery/bitcoin,fanquake/bitcoin,Xekyo/bitcoin,sipsorcery/bitcoin,namecoin/namecoin-core,jambolo/bitcoin,fujicoin/fujicoin,mm-s/bitcoin,GroestlCoin/bitcoin,yenliangl/bitcoin,GroestlCoin/bitcoin,AkioNak/bitcoin,andreaskern/bitcoin,domob1812/bitcoin,GroestlCoin/GroestlCoin,domob1812/namecore,domob1812/namecore,bitcoinknots/bitcoin,MarcoFalke/bitcoin,Xekyo/bitcoin,yenliangl/bitcoin,AkioNak/bitcoin,mm-s/bitcoin,domob1812/namecore,ajtowns/bitcoin,jambolo/bitcoin,pataquets/namecoin-core,andreaskern/bitcoin,namecoin/namecoin-core,domob1812/namecore,namecoin/namecore,yenliangl/bitcoin,namecoin/namecore,bitcoinsSG/bitcoin,instagibbs/bitcoin,kallewoof/bitcoin,namecoin/namecore,GroestlCoin/GroestlCoin