provider/aws: Add JSON validation to the aws_sqs_queue_policy resource.

[kwilczynski]

This commit adds support for new helper function which is used to
normalise and validate JSON string.

Signed-off-by: Krzysztof Wilczynski krzysztof.wilczynski@linux.com

[kwilczynski]

Part of work which began in #8028.

[kwilczynski]

Acceptance test is passing:

$ make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSSQSQueuePolicy'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2016/09/14 12:12:55 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSSQSQueuePolicy -timeout 120m
=== RUN   TestAccAWSSQSQueuePolicy_basic
--- PASS: TestAccAWSSQSQueuePolicy_basic (27.77s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    27.788s

[stack72]

LGTM! Thanks for the work here :)

% make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSSQSQueuePolicy_basic'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2016/09/21 09:19:28 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSSQSQueuePolicy_basic -timeout 120m
=== RUN   TestAccAWSSQSQueuePolicy_basic
--- PASS: TestAccAWSSQSQueuePolicy_basic (24.80s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    24.842s

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