code: @Override
      public DescribeOperatingSystemsResult describeOperatingSystems(DescribeOperatingSystemsRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeOperatingSystems(request);
      }
docs: <p>
  Describes the operating systems that are supported by AWS OpsWorks Stacks.
  </p>
  
  @param describeOperatingSystemsRequest
  @return Result of the DescribeOperatingSystems operation returned by the service.
  @sample AWSOpsWorks.DescribeOperatingSystems
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/opsworks-2013-02-18/DescribeOperatingSystems"
  target="_top">AWS API Documentation</a>