provider/aws: Support import of Route53 records with underscores.

[rynbrd]

This is an attempt to fix #14465.

[rynbrd]

My initial attempt to fix this doesn't actually work. When I run a terraform plan I end up with this:

-/+ aws_route53_record.tld_mailgun_key
    fqdn:               "cntr.io" => "<computed>"
    name:               "" => "krs._domainkey.cntr.io" (forces new resource)
    records.#:          "1" => "1"
    records.1008113961: "v=spf1 include:mailgun.org ~all" => ""
    records.1512342320: "" => "\"k=rsa; p=ABCDEFG\""
    ttl:                "300" => "300"
    type:               "TXT" => "TXT"
    zone_id:            "SANITIZEDZONEID" => "SANITIZEDZONEID"

It's generating the wrong fqdn in the process somehow.

[stack72]

Closed via #14717

Thanks for the work here @bluedragonx - I have just migrated another version of this across to the new Terraform AWS Provider repo

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

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