message: alter the grpc help comments
diff: @@ -33,7 +33,10 @@ int initialize(int argc, char *argv[])
  cout << endl;
  cout << "Options:" << endl;
  cout << "\t-h,--help\t\tDisplay this message." << endl;
  + cout << "\t-db,--database[option],\t\tthe database name.Default value is empty. Notice that the name can not end with .db" << endl;
  cout << "\t-p,--port[option],\t\tthe listen port. Default value is 9000." << endl;
  + cout << "\t-c,--csr[option],\t\tEnable CSR Struct or not. 0 denote that false, 1 denote that true. Default value is 0." << endl;
  +
  cout << endl;
  return 0;
  }
  @@ -83,7 +86,7 @@ int main(int argc, char *argv[])
  while (true)
  {
  pid_t fpid = fork();
  - cout << "fpid:" << fpid << endl;
  + // cout << "fpid:" << fpid << endl;
  if (fpid == 0)
  {
  int ret = initialize(argc, argv);
  