Add standalone gencerts utility to create RPC TLS certificates.
Add standalone gencerts utility to create RPC TLS certificates.

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