DNS Level implementation

Based on the requested creative we put logic at the DNS level to send the viewer to the right CDN creative.

See the reference side-by-side comparison Streaming options.

	DNS Level implementation
Pros	* We can support multiple CDNs we control it at the DNS layer. * We save an extra hop. * Should work for any type of device.
Cons	* DNS TTL are not always respected. * DNS updates can be lagging. * Unconventional way of doing it.