Gets and Sets the CNAME property.
A CNAME alias you want to associate with this distribution. You can have up to
10 CNAME aliases per distribution. For more information, refer:
http://docs.amazonwebservices.com/AmazonCloudFront/latest/DeveloperGuide/CNAMEs.html
Remarks
Only include a CNAME element if you have a CNAME to associate with the distribution.
Don't include an empty CNAME element in the CloudFrontDistributionConfig object. If you do, CloudFront
returns a MalformedXML error. Only 10 CNAME aliases can be specified for a distribution.