provider/aws: Add aws_sqs_queue_policy

[radeksimko]

This may conflict with #8650 so it's probably best to merge that one 1st and then let me rebase this PR.

Test plan

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

TF_ACC=1 go test ./builtin/providers/aws -v -run=AWSSQSQueuePolicy -timeout 120m
=== RUN   TestAccAWSSQSQueuePolicy_basic
--- PASS: TestAccAWSSQSQueuePolicy_basic (30.99s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    31.006s

[stack72]

@radeksimko this LGTM! Ran all SQS tests just to make sure

% make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSSQS'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2016/09/05 09:52:33 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSSQS -timeout 120m
=== RUN   TestAccAWSSQSQueue_importBasic
--- PASS: TestAccAWSSQSQueue_importBasic (19.02s)
=== RUN   TestAccAWSSQSQueuePolicy_basic
--- PASS: TestAccAWSSQSQueuePolicy_basic (23.01s)
=== RUN   TestAccAWSSQSQueue_basic
--- PASS: TestAccAWSSQSQueue_basic (45.93s)
=== RUN   TestAccAWSSQSQueue_redrivePolicy
--- PASS: TestAccAWSSQSQueue_redrivePolicy (26.26s)
=== RUN   TestAccAWSSQSQueue_Policybasic
--- PASS: TestAccAWSSQSQueue_Policybasic (32.51s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    146.747s

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