provider/aws: DB Subnet group arn output

[stack72]

Adding the ARN as an output of the DB Subnet Group

TF_LOG=1 make testacc TEST=./builtin/providers/aws TESTARGS='-run=AWSDBSubnetGroup' 2>~/tf.log
go generate ./...
TF_ACC=1 go test ./builtin/providers/aws -v -run=AWSDBSubnetGroup -timeout 90m
=== RUN   TestAccAWSDBSubnetGroup_basic
--- PASS: TestAccAWSDBSubnetGroup_basic (19.87s)
=== RUN   TestAccAWSDBSubnetGroup_withUndocumentedCharacters
--- PASS: TestAccAWSDBSubnetGroup_withUndocumentedCharacters (20.95s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    40.836s

[catsby]

Thanks 😄

[ghost]

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