PeerGroup: Add number of discoverers to discoverPeers() log message.
PeerGroup: Add number of discoverers to discoverPeers() log message.

natzei/bitcoinj,bitcoinj/bitcoinj,natzei/bitcoinj,peterdettman/bitcoinj,yenliangl/bitcoinj,peterdettman/bitcoinj,bitcoinj/bitcoinj,yenliangl/bitcoinj