message: Update the metad conf template
  1. ADD meta_server_addrs flag.
  2. Tell users, metad can't use multi data paths.
  close
diff: --logbufsecs=0
  ########## networking ##########
  +# Meta Server Address
  +--meta_server_addrs=127.0.0.1:45500
  # Local ip
  --local_ip=127.0.0.1
  # Meta daemon listening port
  --ws_h2_port=11002
  ########## storage ##########
  -# Root data path, multi paths should be split by comma.For rocksdb engine, one path one instance.
  +# Root data path, here should be only single path for metad
  --data_path=data/meta
  