r/_aws_s3_bucket_metric: Refactor to use keyvaluetags package.
r/_aws_s3_bucket_metric: Refactor to use keyvaluetags package.

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