code: @Override
      public DescribeImageAttributeResult describeImageAttribute(DescribeImageAttributeRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeImageAttribute(request);
      }
docs: <p>
  Describes the specified attribute of the specified AMI. You can specify only one attribute at a time.
  </p>
  
  @param describeImageAttributeRequest
  Contains the parameters for DescribeImageAttribute.
  @return Result of the DescribeImageAttribute operation returned by the service.
  @sample AmazonEC2.DescribeImageAttribute
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/ec2-2016-11-15/DescribeImageAttribute" target="_top">AWS API
  Documentation</a>