@Override
  public Connection getConnection(
      final String username, final String password, final String sqlDialect) throws SQLException {
    return new ClusterTestConnection(
        getWriteConnection(null, username, password, sqlDialect),
        getReadConnections(null, username, password, sqlDialect));
  }
check whether all nodes' status match the provided predicate with RPC. after retryCount times,
if the status of all nodes still not match the predicate, throw AssertionError.

@param statusCheck the predicate to test the status of nodes
integration-test/src/main/java/org/apache/iotdb/it/env/cluster/env/AbstractEnv.java