[WIP] Add AWS SES dkim resource

[arr-dev]

Added aws_ses_dkim resource, according to http://docs.aws.amazon.com/ses/latest/DeveloperGuide/easy-dkim-dns-records.html

Would like some feedback on schema, not sure if there is anything else needed here.

Haven't ran integration test since I'am having issues with my personal AWS account,
but hope to enable it soon so I can test this, hopefully having some feedback before that.

[leonsmith]

Do you think its wise to change the count = 3 in the example docs to be "${length(aws_ses_domain_dkim.example.dkim_tokens)}" ?

I imagine it will be copied out of the docs verbatim so thats a bit more future proof incase the the number of dkim tokens changes?

[arr-dev]

I actually tried that and Terraform reported that count can't be interpolated or something like that.
It was strange to me to.

I should probably close this PR and reopen it on https://github.com/terraform-providers/terraform-provider-aws?

[handlerbot]

I'd love to get this into Terraform, this is one of the last manual Route 53 editing operations we have to do for our turnups. :-D

@apparentlymart @radeksimko This looks ~ready to go after fixing the (what should be trivial) conflicts in provider.go and aws.erb, can this be uplifted to terraform-provider-aws?

If not, @arr-dev, do you have time to recreate the PR there, or should I do it, while giving you all credit for the code?

[arr-dev]

@handlerbot I'll submit a PR tomorrow or monday the latest. Thanks for reminding me of this

[arr-dev]

Recreated at hashicorp/terraform-provider-aws#1786

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