Remove tesnet specific rules unsupported blurb.
Remove tesnet specific rules unsupported blurb.

The testnet specific rules have been supported since commit
9787f46f6acbfacdad4baacaa2b235f766bfa456.

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