p2p: add CInv transaction message helper methods
p2p: add CInv transaction message helper methods

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