provider/aws: Add aws_sns_topic_policy

[radeksimko]

Test plan

make testacc TEST=./builtin/providers/aws TESTARGS='-run=AWSSNSTopicPolicy'

TF_ACC=1 go test ./builtin/providers/aws -v -run=AWSSNSTopicPolicy -timeout 120m
=== RUN   TestAccAWSSNSTopicPolicy_basic
--- PASS: TestAccAWSSNSTopicPolicy_basic (25.03s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    25.055s

[stack72]

:)

[stack72]

@radeksimko this is a great addition! Tests are green :)

% make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSSNSTopicPolicy_'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2016/09/04 20:45:27 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSSNSTopicPolicy_ -timeout 120m
=== RUN   TestAccAWSSNSTopicPolicy_basic
--- PASS: TestAccAWSSNSTopicPolicy_basic (61.15s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    61.168s

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