refactor: Put`TryParsePermissionFlags` in anonymous namespace
refactor: Put`TryParsePermissionFlags` in anonymous namespace

It's only used inside `net_permissions.cpp`.

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