r/aws_dx_connection: Refactor tagging logic to keyvaluetags package.
r/aws_dx_connection: Refactor tagging logic to keyvaluetags package.

kjmkznr/terraform-provider-aws,kjmkznr/terraform-provider-aws,kjmkznr/terraform-provider-aws,terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws,terraform-providers/terraform-provider-aws,kjmkznr/terraform-provider-aws,terraform-providers/terraform-provider-aws