provider/aws: New DataSource: aws_partition

[ValFadeev]

Hello, my first PR here.

This data source allows AWS partition too be looked up when constructing resource ARN's, for example, in IAM policy documents. One less variable to keep track of when writing manifests to be reused in different partitions, e.g. aws/aws-cn. Inspiration taken from aws_caller_identity.

data "aws_partition" "current" { }

data "aws_iam_policy_document" "s3_policy" {
  statement {
    sid = "1"

    actions = [
      "s3:ListBucket",
    ]

    resources = [
      "arn:${data.aws_partition.current.partition}:s3:::my-bucket",
    ]
  }
}

resource "aws_iam_policy" "s3_policy" {
  name   = "my-policy"
  path   = "/"
  policy = "${data.aws_iam_policy_document.s3_policy.json}"
}

TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSPartition_basic -timeout 120m
=== RUN   TestAccAWSPartition_basic
--- PASS: TestAccAWSPartition_basic (10.81s)
PASS
ok  	github.com/hashicorp/terraform/builtin/providers/aws	10.837s

[stack72]

This is a fantastic data source! Nice work :)

% make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSPartition_basic'                                                        ✭
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/02/04 12:52:43 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSPartition_basic -timeout 120m
=== RUN   TestAccAWSPartition_basic
--- PASS: TestAccAWSPartition_basic (52.19s)
PASS
ok  	github.com/hashicorp/terraform/builtin/providers/aws	52.212s

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