provider/aws: Add JSON validation to the aws_kms_key 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=TestAccAWSKmsKey_'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2016/09/14 17:30:35 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSKmsKey_ -timeout 120m
=== RUN   TestAccAWSKmsKey_importBasic
--- PASS: TestAccAWSKmsKey_importBasic (46.64s)
=== RUN   TestAccAWSKmsKey_basic
--- PASS: TestAccAWSKmsKey_basic (56.70s)
=== RUN   TestAccAWSKmsKey_policy
--- PASS: TestAccAWSKmsKey_policy (46.68s)
=== RUN   TestAccAWSKmsKey_isEnabled
--- PASS: TestAccAWSKmsKey_isEnabled (527.79s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    677.830s

[stack72]

Do we need to check for any errors here?

[stack72]

LGTM! Thanks for the work here :)

% make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSKmsKey_'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2016/09/22 09:16:33 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSKmsKey_ -timeout 120m
=== RUN   TestAccAWSKmsKey_importBasic
--- PASS: TestAccAWSKmsKey_importBasic (56.41s)
=== RUN   TestAccAWSKmsKey_basic
--- PASS: TestAccAWSKmsKey_basic (68.63s)
=== RUN   TestAccAWSKmsKey_policy
--- PASS: TestAccAWSKmsKey_policy (55.11s)
=== RUN   TestAccAWSKmsKey_isEnabled
--- PASS: TestAccAWSKmsKey_isEnabled (298.81s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    478.973s

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