def validate_required_all(required_configs)
      required_configs.each do |config|
        unless config_set?(config)
          message = "Configuration value `#{config}` is required."
          raise ConfigurationError, message
        end
      end
    end
def validate_required_all(required_configs)
      required_configs.each do |config|
        unless config_set?(config)
          message = "Configuration value `#{config}` is required."
          raise ConfigurationError, message
        end
      end
    end
Loops through the list of required configurations and raises an error
 if a it can't find all the configuration values set
 @return [nil]