testscript: convert all print statements to log.write()
testscript: convert all print statements to log.write()

daedalus/pynode,daedalus/python-bitcoin_r,petertodd/stealth-addresses-ref-implementation,robertsdotpm/python-bitcoinlib,jgarzik/python-bitcoinlib,petertodd/dust-b-gone,jgarzik/pynode,petertodd/tx-flood-attack