message: Add info replication item
  Add consensus last_log to command "info replication".
diff: @@ -990,6 +990,10 @@ void InfoCmd::InfoReplication(std::string& info) {
  tmp_stream << table_name << " binlog_offset=" << filenum << " " << offset;
  s = master_partition->GetSafetyPurgeBinlog(&safety_purge);
  tmp_stream << ",safety_purge=" << (s.ok() ? safety_purge : "error") << "\r\n";
  + if (g_pika_conf->consensus_level()) {
  + LogOffset last_log = master_partition->ConsensusLastIndex();
  + tmp_stream << table_name << " consensus last_log=" << last_log.ToString() << "\r\n";
  + }
  }
  }
  