def equal_driver_config?(config1, config2)
      return false unless config1[:host]        == config2[:host]
      return false unless config1[:port]        == config2[:port]
      return false unless config1[:timeout_sec] == config2[:timeout_sec]
      return false unless config1[:pool_size]   == config2[:pool_size]
      return false unless config1[:config_key]  == config2[:config_key]
      return true
    end
def equal_driver_config?(config1, config2)
      return false unless config1[:host]        == config2[:host]
      return false unless config1[:port]        == config2[:port]
      return false unless config1[:timeout_sec] == config2[:timeout_sec]
      return false unless config1[:pool_size]   == config2[:pool_size]
      return false unless config1[:config_key]  == config2[:config_key]
      return true
    end
compare driver config.

 @param config1 [Hash] driver config
 @param config2 [Hash] driver config