contrib: Clean up previous_releases.py
contrib: Clean up previous_releases.py

* Replace curl single char options with their verbose counterpart
* Stricter check for tarballHash

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