Add AdminPageCloudFrontDomainName and StatusPageCloudFrontDomainName outputs

[salekseev]

This is to be able to use with external DNS provider (e.g. Cloudflare) if using custom URLs.

This is also to address some internal work on a terraform module that I may contribute back eventually to address #100.

[ks888]

Thank you for the PR! It seems new outputs are similar to existing AdminPageCloudFrontURL and StatusPageCloudFrontURL outputs. Can you tell me the difference?

[salekseev]

The difference is that if you set cutom URLs those outputs contain those URLs instead of CloudFront domain name so they cannot be used to create those needed DNS CNAMEs. Introduced outputs always output CloudFront domain names so can be used to create DNS records.

[ks888]

Sorry for my late reply. I see, you want to automatically set up the DNS setting. Thank you for the clarification.