backend/s3: Support New me-south-1 Region Automatic Validation

[bflad]

Current Terraform Version

Terraform v0.12.5

Use-cases

https://aws.amazon.com/about-aws/whats-new/2019/07/announcing-the-new-aws-middle-east--bahrain--region-/

Amazon Web Services (AWS) is announcing the immediate availability of the Middle East (Bahrain) Region, which is the first AWS Region in the Middle East and consists of three Availability Zones.

The region shorthand name is me-south-1. Allow S3 Backend storage in the new region without special backend configuration.

Available Workaround

terraform {
  # ... potentially other configuration ...

  backend "s3" {
    # ... other configuration ...

    region                 = "me-south-1"
    skip_region_validation = true
  }
}

Proposal

Update AWS Go SDK dependency to v1.21.7, which contains new region endpoint information.

References

• https://aws.amazon.com/about-aws/whats-new/2019/07/announcing-the-new-aws-middle-east--bahrain--region-/
• https://github.com/aws/aws-sdk-go/blob/master/CHANGELOG.md#Release-v1217-2019-07-29
• Update module aws/aws-sdk-go to v1.21.7 terraform-provider-aws#9538
• Support Automatic Region Validation for me-south-1 (Middle East (Bahrain)) terraform-provider-aws#9545
• deps: github.com/aws/[email protected] #22253

[bflad]

This has been merged and will release with Terraform 0.12.6.

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