Adds support for HostedZoneName instead of HostedZoneId in Domain section of the Api

[mbarneyjr]

Issue #, if available:

Issue #1402

Description of changes:

Adds support for inclusion of HostedZoneName instead of HostedZoneId in the Domain section of an AWS::Serverless::Api. This allows users to not need to worry about looking up the hosted zone ID, and letting CloudFormation handle it for them via the AWS::Route53::RecordSetGroup resource.

HostedZoneName is forwarded to the RecordSetGroup resource just as HostedZoneId is.

The following should now be valid SAM:

Globals:
  Api:
    Domain:
      DomainName: www.my-domain.com
      CertificateArn: my-valid-cert-arn
      EndpointConfiguration: EDGE
      Route53:
        HostedZoneName: my-domain.com.

Description of how you validated changes:

Not 100% sure how to validate the changes, didn't immediately see any documentation around it

Checklist:

• Write/update tests
• make pr passes (It doesn't have any more failures than what is on master)
• Update documentation
• Verify transformed template deploys and application functions as expected
• Add/update example to examples/2016-10-31

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[praneetap]

Thank you for the contribution! Could you also change/add a unit test here. I think you can just change one of the existing custom domain tests in https://github.com/awslabs/serverless-application-model/tree/develop/tests/translator/input, and you will have to change the corresponding expected outputs in aws, aws-cn and aws-us-gov

[mbarneyjr]

@praneetap I added the test cases and fixed a bug in the LogicalID generation thatI found because of it, thanks for the guidance!

[praneetap]

Nicely done and thank you!

[praneetap]

@mbarneyjr please run make black, it will auto format for you. That should fix the build.

[keetonian]

Looks like it's just a black formatting error. I submitted #1419 to update the black version that our tests use, this PR should be good to go once that is merged. I don't see any other test issues.

[keetonian]

Closed/re-opened PR to kick off a new travis run. The black formatting issues should now be resolved.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (develop@e018454). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff             @@
##             develop    #1408   +/-   ##
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  Coverage           ?   94.42%           
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  Files              ?       78           
  Lines              ?     4666           
  Branches           ?      932           
==========================================
  Hits               ?     4406           
  Misses             ?      121           
  Partials           ?      139

Impacted Files	Coverage Δ
samtranslator/model/api/api_generator.py	95.02% <100%> (ø)
samtranslator/model/sam_resources.py	94.06% <100%> (ø)

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[keetonian]

@mbarneyjr Thank you for this contribution!