Add aws_iam_account_alias resource

[bodgit]

This PR adds a new resource for managing the IAM account alias on AWS, there was a datasource for it added in #10804 but no corresponding resource to manage it:

resource "aws_iam_account_alias" "alias" {
  account_alias = "my-test-alias"
}

It can also import an existing alias if necessary:

$ terraform import aws_iam_account_alias.alias my-test-alias

AWS accounts can only have one alias associated and this is noted in the documentation.

Tests are present and pass:

$ make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSIAMAccountAlias'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/03/13 11:32:39 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSIAMAccountAlias -timeout 120m
=== RUN   TestAccAWSIAMAccountAlias_importBasic
--- PASS: TestAccAWSIAMAccountAlias_importBasic (7.29s)
=== RUN   TestAccAWSIAMAccountAlias_basic
--- PASS: TestAccAWSIAMAccountAlias_basic (6.35s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    13.897s

I have to include the following disclaimer to keep my employers legal team happy:

This contribution is provided 'as is' and without any warranty or guarantee of any kind, express or implied, including in relation to its quality, suitability for a particular purpose or non-infringement. To the extent permitted by law, in no event shall the creator of this contribution be liable for any claim, damage or other liability, whether arising in contract, tort or otherwise, arising out of or in connection with this contribution.

[stack72]

Hi @bodgit

Thanks for the work here - this LGTM :)

% make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSIAMAccountAlias'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/03/14 15:33:21 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSIAMAccountAlias -timeout 120m
=== RUN   TestAccAWSIAMAccountAlias_importBasic
--- PASS: TestAccAWSIAMAccountAlias_importBasic (32.69s)
=== RUN   TestAccAWSIAMAccountAlias_basic
--- PASS: TestAccAWSIAMAccountAlias_basic (22.10s)
PASS
ok  	github.com/hashicorp/terraform/builtin/providers/aws	54.824s

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