Rename includeconf variables for clarity
Rename includeconf variables for clarity

includeconf -> conf_file_names
to_include -> conf_file_name
include_config -> conf_file_stream

Suggestion from John Newbery <john@johnnewbery.com> in
https://github.com/bitcoin/bitcoin/pull/15934#discussion_r343905138

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