provider/aws: Add support for cname_prefix to aws_elastic_beanstalk_environment resource.

[dharrisio]

Adds support for setting cname_prefix. This also sets 'WebServer' as the default tier type, which is consistent with the Elastic Beanstalk API when tier is omitted. This cleans up the check to make sure cname_prefix is not being set for a 'Worker' tier, which does not support cname_prefix.

TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSBeanstalkEnv_cname_prefix -timeout 120m
=== RUN   TestAccAWSBeanstalkEnv_cname_prefix
--- PASS: TestAccAWSBeanstalkEnv_cname_prefix (349.97s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    349.979s

[stack72]

Hi @dharrisio

thanks for the PR here - can you rebase this now that the wait_for_timeout PR has been merged :)

thanks

Paul

[dharrisio]

@stack72 This has been rebased.

Thanks!

[catsby]

Thanks!

[ghost]

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