add `--retry 5` to curl opts in install_db4.sh
add `--retry 5` to curl opts in install_db4.sh

jlopp/statoshi,afk11/bitcoin,droark/bitcoin,bitcoinknots/bitcoin,lateminer/bitcoin,pataquets/namecoin-core,jnewbery/bitcoin,cdecker/bitcoin,rnicoll/bitcoin,fujicoin/fujicoin,ElementsProject/elements,andreaskern/bitcoin,alecalve/bitcoin,particl/particl-core,yenliangl/bitcoin,myriadteam/myriadcoin,Xekyo/bitcoin,jonasschnelli/bitcoin,sstone/bitcoin,rnicoll/bitcoin,jnewbery/bitcoin,vertcoin/vertcoin,tjps/bitcoin,n1bor/bitcoin,sstone/bitcoin,pataquets/namecoin-core,GroestlCoin/bitcoin,Xekyo/bitcoin,bitcoinsSG/bitcoin,alecalve/bitcoin,namecoin/namecoin-core,droark/bitcoin,tjps/bitcoin,jtimon/bitcoin,namecoin/namecore,bitcoin/bitcoin,untrustbank/litecoin,particl/particl-core,bespike/litecoin,OmniLayer/omnicore,namecoin/namecoin-core,jtimon/bitcoin,pstratem/bitcoin,litecoin-project/litecoin,achow101/bitcoin,jtimon/bitcoin,cdecker/bitcoin,mm-s/bitcoin,sstone/bitcoin,wellenreiter01/Feathercoin,pstratem/bitcoin,rnicoll/bitcoin,DigitalPandacoin/pandacoin,MeshCollider/bitcoin,fujicoin/fujicoin,r8921039/bitcoin,AkioNak/bitcoin,pstratem/bitcoin,GroestlCoin/bitcoin,instagibbs/bitcoin,untrustbank/litecoin,achow101/bitcoin,pataquets/namecoin-core,instagibbs/bitcoin,anditto/bitcoin,apoelstra/bitcoin,prusnak/bitcoin,domob1812/namecore,wellenreiter01/Feathercoin,GroestlCoin/bitcoin,myriadcoin/myriadcoin,n1bor/bitcoin,particl/particl-core,particl/particl-core,r8921039/bitcoin,GroestlCoin/GroestlCoin,domob1812/namecore,jlopp/statoshi,sipsorcery/bitcoin,qtumproject/qtum,ElementsProject/elements,FeatherCoin/Feathercoin,tecnovert/particl-core,instagibbs/bitcoin,sstone/bitcoin,bitcoinsSG/bitcoin,jlopp/statoshi,jambolo/bitcoin,bespike/litecoin,dscotese/bitcoin,rnicoll/dogecoin,ahmedbodi/vertcoin,sstone/bitcoin,tjps/bitcoin,litecoin-project/litecoin,mruddy/bitcoin,jnewbery/bitcoin,lateminer/bitcoin,achow101/bitcoin,MarcoFalke/bitcoin,jambolo/bitcoin,kallewoof/bitcoin,droark/bitcoin,JeremyRubin/bitcoin,EthanHeilman/bitcoin,tecnovert/particl-core,andreaskern/bitcoin,bespike/litecoin,midnightmagic/bitcoin,monacoinproject/monacoin,bespike/litecoin,practicalswift/bitcoin,namecoin/namecoin-core,instagibbs/bitcoin,namecoin/namecore,litecoin-project/litecoin,gjhiggins/vcoincore,andreaskern/bitcoin,alecalve/bitcoin,afk11/bitcoin,bitcoinknots/bitcoin,nikkitan/bitcoin,jamesob/bitcoin,pataquets/namecoin-core,qtumproject/qtum,namecoin/namecore,MarcoFalke/bitcoin,yenliangl/bitcoin,peercoin/peercoin,alecalve/bitcoin,OmniLayer/omnicore,OmniLayer/omnicore,jtimon/bitcoin,cdecker/bitcoin,jambolo/bitcoin,bitcoinknots/bitcoin,kallewoof/bitcoin,apoelstra/bitcoin,wellenreiter01/Feathercoin,ajtowns/bitcoin,vertcoin/vertcoin,Xekyo/bitcoin,jlopp/statoshi,qtumproject/qtum,tjps/bitcoin,anditto/bitcoin,dscotese/bitcoin,myriadcoin/myriadcoin,afk11/bitcoin,anditto/bitcoin,apoelstra/bitcoin,GroestlCoin/bitcoin,vertcoin/vertcoin,jtimon/bitcoin,gjhiggins/vcoincore,kallewoof/bitcoin,myriadcoin/myriadcoin,anditto/bitcoin,tecnovert/particl-core,lateminer/bitcoin,bitcoin/bitcoin,afk11/bitcoin,gjhiggins/vcoincore,Xekyo/bitcoin,MeshCollider/bitcoin,ajtowns/bitcoin,peercoin/peercoin,fujicoin/fujicoin,JeremyRubin/bitcoin,mm-s/bitcoin,andreaskern/bitcoin,apoelstra/bitcoin,OmniLayer/omnicore,MarcoFalke/bitcoin,jlopp/statoshi,mitchellcash/bitcoin,bitcoin/bitcoin,MeshCollider/bitcoin,practicalswift/bitcoin,DigitalPandacoin/pandacoin,n1bor/bitcoin,EthanHeilman/bitcoin,achow101/bitcoin,mitchellcash/bitcoin,GroestlCoin/GroestlCoin,fanquake/bitcoin,sipsorcery/bitcoin,sipsorcery/bitcoin,monacoinproject/monacoin,rnicoll/dogecoin,ElementsProject/elements,mitchellcash/bitcoin,monacoinproject/monacoin,r8921039/bitcoin,lateminer/bitcoin,jambolo/bitcoin,ahmedbodi/vertcoin,pstratem/bitcoin,instagibbs/bitcoin,CryptArc/bitcoin,instagibbs/bitcoin,ahmedbodi/vertcoin,droark/bitcoin,EthanHeilman/bitcoin,domob1812/bitcoin,gjhiggins/vcoincore,mruddy/bitcoin,namecoin/namecore,prusnak/bitcoin,domob1812/namecore,tjps/bitcoin,gjhiggins/vcoincore,bitcoinknots/bitcoin,jambolo/bitcoin,dscotese/bitcoin,yenliangl/bitcoin,nikkitan/bitcoin,GroestlCoin/bitcoin,MeshCollider/bitcoin,AkioNak/bitcoin,domob1812/bitcoin,CryptArc/bitcoin,AkioNak/bitcoin,jlopp/statoshi,yenliangl/bitcoin,domob1812/bitcoin,GroestlCoin/GroestlCoin,dscotese/bitcoin,alecalve/bitcoin,ahmedbodi/vertcoin,vertcoin/vertcoin,midnightmagic/bitcoin,FeatherCoin/Feathercoin,apoelstra/bitcoin,peercoin/peercoin,n1bor/bitcoin,MeshCollider/bitcoin,JeremyRubin/bitcoin,fujicoin/fujicoin,mruddy/bitcoin,namecoin/namecore,pstratem/bitcoin,bitcoin/bitcoin,r8921039/bitcoin,FeatherCoin/Feathercoin,mitchellcash/bitcoin,practicalswift/bitcoin,bitcoin/bitcoin,mitchellcash/bitcoin,fanquake/bitcoin,myriadcoin/myriadcoin,droark/bitcoin,sipsorcery/bitcoin,MeshCollider/bitcoin,monacoinproject/monacoin,qtumproject/qtum,kallewoof/bitcoin,DigitalPandacoin/pandacoin,jamesob/bitcoin,CryptArc/bitcoin,prusnak/bitcoin,DigitalPandacoin/pandacoin,untrustbank/litecoin,domob1812/bitcoin,midnightmagic/bitcoin,bitcoin/bitcoin,domob1812/namecore,bespike/litecoin,qtumproject/qtum,anditto/bitcoin,bitcoinsSG/bitcoin,MarcoFalke/bitcoin,wellenreiter01/Feathercoin,DigitalPandacoin/pandacoin,Sjors/bitcoin,droark/bitcoin,Sjors/bitcoin,nikkitan/bitcoin,ajtowns/bitcoin,nikkitan/bitcoin,cdecker/bitcoin,myriadcoin/myriadcoin,Xekyo/bitcoin,peercoin/peercoin,afk11/bitcoin,practicalswift/bitcoin,domob1812/namecore,CryptArc/bitcoin,afk11/bitcoin,andreaskern/bitcoin,GroestlCoin/bitcoin,JeremyRubin/bitcoin,particl/particl-core,fujicoin/fujicoin,ElementsProject/elements,GroestlCoin/GroestlCoin,vertcoin/vertcoin,domob1812/namecore,vertcoin/vertcoin,n1bor/bitcoin,Sjors/bitcoin,FeatherCoin/Feathercoin,r8921039/bitcoin,JeremyRubin/bitcoin,peercoin/peercoin,bespike/litecoin,prusnak/bitcoin,domob1812/bitcoin,midnightmagic/bitcoin,pataquets/namecoin-core,fanquake/bitcoin,mruddy/bitcoin,GroestlCoin/GroestlCoin,achow101/bitcoin,kallewoof/bitcoin,OmniLayer/omnicore,sipsorcery/bitcoin,rnicoll/bitcoin,ajtowns/bitcoin,jonasschnelli/bitcoin,n1bor/bitcoin,jnewbery/bitcoin,myriadteam/myriadcoin,cdecker/bitcoin,EthanHeilman/bitcoin,untrustbank/litecoin,gjhiggins/vcoincore,rnicoll/dogecoin,namecoin/namecoin-core,jonasschnelli/bitcoin,rnicoll/dogecoin,sstone/bitcoin,jamesob/bitcoin,fanquake/bitcoin,rnicoll/dogecoin,jamesob/bitcoin,FeatherCoin/Feathercoin,JeremyRubin/bitcoin,kallewoof/bitcoin,pataquets/namecoin-core,EthanHeilman/bitcoin,AkioNak/bitcoin,OmniLayer/omnicore,tecnovert/particl-core,jnewbery/bitcoin,myriadteam/myriadcoin,litecoin-project/litecoin,lateminer/bitcoin,wellenreiter01/Feathercoin,ahmedbodi/vertcoin,fanquake/bitcoin,untrustbank/litecoin,tjps/bitcoin,nikkitan/bitcoin,cdecker/bitcoin,bitcoinsSG/bitcoin,jonasschnelli/bitcoin,practicalswift/bitcoin,mm-s/bitcoin,yenliangl/bitcoin,jamesob/bitcoin,fanquake/bitcoin,mruddy/bitcoin,EthanHeilman/bitcoin,GroestlCoin/GroestlCoin,jamesob/bitcoin,dscotese/bitcoin,ElementsProject/elements,AkioNak/bitcoin,MarcoFalke/bitcoin,bitcoinknots/bitcoin,namecoin/namecoin-core,myriadteam/myriadcoin,jtimon/bitcoin,monacoinproject/monacoin,mm-s/bitcoin,apoelstra/bitcoin,andreaskern/bitcoin,jambolo/bitcoin,Sjors/bitcoin,qtumproject/qtum,rnicoll/bitcoin,jonasschnelli/bitcoin,monacoinproject/monacoin,midnightmagic/bitcoin,mitchellcash/bitcoin,prusnak/bitcoin,myriadteam/myriadcoin,mm-s/bitcoin,sipsorcery/bitcoin,mm-s/bitcoin,Sjors/bitcoin,pstratem/bitcoin,alecalve/bitcoin,particl/particl-core,namecoin/namecoin-core,CryptArc/bitcoin,tecnovert/particl-core,ajtowns/bitcoin,ahmedbodi/vertcoin,dscotese/bitcoin,achow101/bitcoin,anditto/bitcoin,myriadcoin/myriadcoin,mruddy/bitcoin,yenliangl/bitcoin,MarcoFalke/bitcoin,AkioNak/bitcoin,nikkitan/bitcoin,bitcoinsSG/bitcoin,litecoin-project/litecoin,midnightmagic/bitcoin,tecnovert/particl-core,rnicoll/bitcoin,wellenreiter01/Feathercoin,litecoin-project/litecoin,fujicoin/fujicoin,CryptArc/bitcoin,ajtowns/bitcoin,r8921039/bitcoin,lateminer/bitcoin,Xekyo/bitcoin,bitcoinsSG/bitcoin,practicalswift/bitcoin,peercoin/peercoin,qtumproject/qtum,ElementsProject/elements,prusnak/bitcoin,myriadteam/myriadcoin,domob1812/bitcoin,FeatherCoin/Feathercoin,namecoin/namecore,untrustbank/litecoin,DigitalPandacoin/pandacoin