Revert "Cache parent xpub inside of BIP32PubkeyProvider"
Revert "Cache parent xpub inside of BIP32PubkeyProvider"

This reverts commit 09e25071f40c564af08a1386c39c4f2d8eb484b6.

The changes made in this commit have turned out to be unnecessary and
confusing, so it is being reverted.

ElementsProject/elements,mm-s/bitcoin,instagibbs/bitcoin,ajtowns/bitcoin,mruddy/bitcoin,jamesob/bitcoin,instagibbs/bitcoin,particl/particl-core,fujicoin/fujicoin,jlopp/statoshi,prusnak/bitcoin,mm-s/bitcoin,dscotese/bitcoin,prusnak/bitcoin,namecoin/namecore,dscotese/bitcoin,lateminer/bitcoin,GroestlCoin/GroestlCoin,jambolo/bitcoin,dscotese/bitcoin,anditto/bitcoin,bitcoin/bitcoin,domob1812/bitcoin,GroestlCoin/GroestlCoin,namecoin/namecore,kallewoof/bitcoin,fanquake/bitcoin,prusnak/bitcoin,Xekyo/bitcoin,pataquets/namecoin-core,lateminer/bitcoin,pataquets/namecoin-core,namecoin/namecoin-core,pataquets/namecoin-core,bitcoinknots/bitcoin,mruddy/bitcoin,qtumproject/qtum,jlopp/statoshi,dscotese/bitcoin,jambolo/bitcoin,namecoin/namecoin-core,apoelstra/bitcoin,apoelstra/bitcoin,fanquake/bitcoin,bitcoinsSG/bitcoin,andreaskern/bitcoin,jamesob/bitcoin,bitcoin/bitcoin,andreaskern/bitcoin,mruddy/bitcoin,anditto/bitcoin,instagibbs/bitcoin,andreaskern/bitcoin,yenliangl/bitcoin,qtumproject/qtum,ElementsProject/elements,AkioNak/bitcoin,AkioNak/bitcoin,mruddy/bitcoin,jlopp/statoshi,particl/particl-core,domob1812/namecore,AkioNak/bitcoin,qtumproject/qtum,fanquake/bitcoin,GroestlCoin/GroestlCoin,tecnovert/particl-core,mm-s/bitcoin,anditto/bitcoin,prusnak/bitcoin,MarcoFalke/bitcoin,domob1812/namecore,pataquets/namecoin-core,anditto/bitcoin,bitcoin/bitcoin,tecnovert/particl-core,GroestlCoin/bitcoin,lateminer/bitcoin,achow101/bitcoin,kallewoof/bitcoin,andreaskern/bitcoin,qtumproject/qtum,prusnak/bitcoin,apoelstra/bitcoin,tecnovert/particl-core,yenliangl/bitcoin,namecoin/namecore,andreaskern/bitcoin,MarcoFalke/bitcoin,andreaskern/bitcoin,GroestlCoin/bitcoin,fanquake/bitcoin,sstone/bitcoin,Xekyo/bitcoin,anditto/bitcoin,qtumproject/qtum,MarcoFalke/bitcoin,fujicoin/fujicoin,achow101/bitcoin,sstone/bitcoin,domob1812/bitcoin,achow101/bitcoin,mm-s/bitcoin,AkioNak/bitcoin,bitcoinsSG/bitcoin,GroestlCoin/GroestlCoin,apoelstra/bitcoin,dscotese/bitcoin,ElementsProject/elements,dscotese/bitcoin,bitcoin/bitcoin,namecoin/namecore,domob1812/bitcoin,Xekyo/bitcoin,bitcoinknots/bitcoin,namecoin/namecoin-core,bitcoinknots/bitcoin,jlopp/statoshi,sipsorcery/bitcoin,bitcoinknots/bitcoin,particl/particl-core,JeremyRubin/bitcoin,namecoin/namecoin-core,particl/particl-core,mm-s/bitcoin,domob1812/bitcoin,jlopp/statoshi,GroestlCoin/bitcoin,namecoin/namecore,bitcoinknots/bitcoin,Xekyo/bitcoin,namecoin/namecore,jambolo/bitcoin,kallewoof/bitcoin,particl/particl-core,achow101/bitcoin,kallewoof/bitcoin,GroestlCoin/bitcoin,sipsorcery/bitcoin,JeremyRubin/bitcoin,bitcoin/bitcoin,jamesob/bitcoin,AkioNak/bitcoin,fujicoin/fujicoin,ajtowns/bitcoin,fujicoin/fujicoin,sstone/bitcoin,yenliangl/bitcoin,tecnovert/particl-core,qtumproject/qtum,sipsorcery/bitcoin,bitcoinsSG/bitcoin,jambolo/bitcoin,yenliangl/bitcoin,jambolo/bitcoin,achow101/bitcoin,anditto/bitcoin,pataquets/namecoin-core,ajtowns/bitcoin,sipsorcery/bitcoin,apoelstra/bitcoin,mruddy/bitcoin,GroestlCoin/GroestlCoin,JeremyRubin/bitcoin,apoelstra/bitcoin,sipsorcery/bitcoin,fujicoin/fujicoin,GroestlCoin/bitcoin,fanquake/bitcoin,jamesob/bitcoin,namecoin/namecoin-core,domob1812/namecore,lateminer/bitcoin,ajtowns/bitcoin,yenliangl/bitcoin,ajtowns/bitcoin,instagibbs/bitcoin,mm-s/bitcoin,jamesob/bitcoin,lateminer/bitcoin,jambolo/bitcoin,particl/particl-core,sipsorcery/bitcoin,achow101/bitcoin,jlopp/statoshi,MarcoFalke/bitcoin,JeremyRubin/bitcoin,mruddy/bitcoin,ajtowns/bitcoin,domob1812/namecore,ElementsProject/elements,bitcoinsSG/bitcoin,domob1812/namecore,sstone/bitcoin,GroestlCoin/bitcoin,qtumproject/qtum,AkioNak/bitcoin,GroestlCoin/GroestlCoin,domob1812/namecore,jamesob/bitcoin,tecnovert/particl-core,prusnak/bitcoin,instagibbs/bitcoin,kallewoof/bitcoin,kallewoof/bitcoin,bitcoinsSG/bitcoin,sstone/bitcoin,pataquets/namecoin-core,tecnovert/particl-core,ElementsProject/elements,namecoin/namecoin-core,sstone/bitcoin,JeremyRubin/bitcoin,MarcoFalke/bitcoin,domob1812/bitcoin,yenliangl/bitcoin,lateminer/bitcoin,fujicoin/fujicoin,bitcoin/bitcoin,JeremyRubin/bitcoin,Xekyo/bitcoin,domob1812/bitcoin,fanquake/bitcoin,instagibbs/bitcoin,MarcoFalke/bitcoin,Xekyo/bitcoin,ElementsProject/elements,bitcoinsSG/bitcoin