provider/aws: Add test for SNS subscription w/ autoconfirming endpoint

[radeksimko]

Related discussion in #9696 (comment)

Test plan

make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSSNSTopicSubscription_'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/04/24 21:18:42 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSSNSTopicSubscription_ -timeout 120m
=== RUN   TestAccAWSSNSTopicSubscription_importBasic
--- PASS: TestAccAWSSNSTopicSubscription_importBasic (79.53s)
=== RUN   TestAccAWSSNSTopicSubscription_basic
--- PASS: TestAccAWSSNSTopicSubscription_basic (54.58s)
=== RUN   TestAccAWSSNSTopicSubscription_autoConfirmingEndpoint
--- PASS: TestAccAWSSNSTopicSubscription_autoConfirmingEndpoint (137.69s)
PASS
ok  	github.com/hashicorp/terraform/builtin/providers/aws	271.826s

cc @Ninir

[Ninir]

Hey @radeksimko,

Thanks for this :)

Do you think we could version the content of the zip file, and basically create the zip file based on it using the archive data source?

[radeksimko]

I thought about that idea too, but I wanted to avoid spanning the test cross providers and keep it isolated. i.e. I don't want this test to fail just because archive provider becomes broken.

[ghost]

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