Use .haveTransaction in new getmempool RPC code.
Use .haveTransaction in new getmempool RPC code.

The mempool is already locked and the exported version locks it, so the
unexported version is needed.

btcsuitereleases/btcd,ppcsuite/ppcd-old,qchain/btcd,jrick/dcrd,dan-da/btcd,wallclockbuilder/btcd,btcsuite/btcd,DanielKrawisz/btcd,BitGo/prova,jimmysong/btcd,jongillham/btcd,FactomProject/btcd,jrick/dcrd,1d4Nf6/btcd,Roasbeef/btcd,jrick/btcd,DanielKrawisz/btcd,stevenroose/btcd,hectorj/btcd,pkothbauer/btcd,tb00/btcd,adiabat/btcd,cqswxj2013/btcd,btcsuite/btcd,mathiasrw/btcd,Cleawing/btcd,decred/dcrd,cjepson/btcd,CryptocurrencyCabal/htcd,jrick/btcd,mathiasrw/btcd,dajohi/btcd,jimmysong/btcd,Dirbaio/btcd,Evil-Coin/Evil,davecgh/btcd,davecgh/btcd,Evil-Coin/Evil,jongillham/btcd,BitGo/prova,decred/dcrd,danoctavian/btcd,qchain/btcd,stevenroose/btcd,aakselrod/btcd,Dirbaio/btcd,1d4Nf6/btcd,ppcsuite/ppcd,Cleawing/btcd,FactomProject/btcd,jrick/btcd,jcmincke/dcrd,dajohi/btcd,Roasbeef/btcd,sysbot/btcd,jcmincke/dcrd,Stash-Crypto/btcd,aakselrod/btcd,pkothbauer/btcd,runeaune/btcd,toddfries/btcd,sysbot/btcd,adiabat/btcd,soapboxsys/ombfullnode,tb00/btcd,btcsuitereleases/btcd,dan-da/btcd,ltcsuite/ltcd,ppcsuite/ppcd,soapboxsys/ombfullnode,runeaune/btcd,jcmincke/dcrd,cqswxj2013/btcd,glv2/ppcd,hectorj/btcd,dajohi/btcd,glv2/ppcd,Dirbaio/btcd,ltcsuite/ltcd,danoctavian/btcd,wallclockbuilder/btcd,ppcsuite/ppcd-old,Stash-Crypto/btcd,CryptocurrencyCabal/htcd,toddfries/btcd,cjepson/btcd