sqlite: Use in-memory db instead of temp for mockdb
sqlite: Use in-memory db instead of temp for mockdb

The mock db can be in-memory rather than just at temp file.

AkioNak/bitcoin,AkioNak/bitcoin,namecoin/namecoin-core,jambolo/bitcoin,tecnovert/particl-core,mruddy/bitcoin,Xekyo/bitcoin,Xekyo/bitcoin,fanquake/bitcoin,sstone/bitcoin,domob1812/bitcoin,Xekyo/bitcoin,domob1812/bitcoin,jamesob/bitcoin,Xekyo/bitcoin,tecnovert/particl-core,sipsorcery/bitcoin,ajtowns/bitcoin,tecnovert/particl-core,namecoin/namecore,domob1812/bitcoin,sstone/bitcoin,ajtowns/bitcoin,sstone/bitcoin,bitcoin/bitcoin,lateminer/bitcoin,lateminer/bitcoin,ajtowns/bitcoin,jamesob/bitcoin,bitcoinsSG/bitcoin,AkioNak/bitcoin,fujicoin/fujicoin,sipsorcery/bitcoin,fujicoin/fujicoin,fujicoin/fujicoin,kallewoof/bitcoin,jambolo/bitcoin,fujicoin/fujicoin,bitcoin/bitcoin,jamesob/bitcoin,namecoin/namecoin-core,mruddy/bitcoin,tecnovert/particl-core,bitcoin/bitcoin,namecoin/namecoin-core,ajtowns/bitcoin,ajtowns/bitcoin,ajtowns/bitcoin,jamesob/bitcoin,Xekyo/bitcoin,fanquake/bitcoin,sipsorcery/bitcoin,AkioNak/bitcoin,tecnovert/particl-core,namecoin/namecore,kallewoof/bitcoin,instagibbs/bitcoin,domob1812/bitcoin,namecoin/namecore,bitcoinsSG/bitcoin,bitcoin/bitcoin,sstone/bitcoin,mruddy/bitcoin,fanquake/bitcoin,instagibbs/bitcoin,jambolo/bitcoin,Xekyo/bitcoin,namecoin/namecoin-core,tecnovert/particl-core,sipsorcery/bitcoin,sipsorcery/bitcoin,fujicoin/fujicoin,fanquake/bitcoin,bitcoinsSG/bitcoin,mruddy/bitcoin,bitcoinsSG/bitcoin,jambolo/bitcoin,particl/particl-core,kallewoof/bitcoin,namecoin/namecore,jambolo/bitcoin,fanquake/bitcoin,bitcoin/bitcoin,bitcoinsSG/bitcoin,instagibbs/bitcoin,particl/particl-core,instagibbs/bitcoin,fanquake/bitcoin,namecoin/namecoin-core,AkioNak/bitcoin,particl/particl-core,lateminer/bitcoin,kallewoof/bitcoin,namecoin/namecore,lateminer/bitcoin,namecoin/namecoin-core,mruddy/bitcoin,namecoin/namecore,jamesob/bitcoin,domob1812/bitcoin,bitcoinsSG/bitcoin,kallewoof/bitcoin,instagibbs/bitcoin,jambolo/bitcoin,domob1812/bitcoin,particl/particl-core,sstone/bitcoin,instagibbs/bitcoin,bitcoin/bitcoin,particl/particl-core,particl/particl-core,sstone/bitcoin,jamesob/bitcoin,fujicoin/fujicoin,kallewoof/bitcoin,lateminer/bitcoin,sipsorcery/bitcoin,mruddy/bitcoin,AkioNak/bitcoin,lateminer/bitcoin