aws_db_instance engine_version should be optional, not required

[ubergeek42]

According to the AWS docs, engine_version is not a required attribute.
http://docs.aws.amazon.com/AmazonRDS/latest/CommandLineReference/CLIReference-cmd-CreateDBInstance.html

Seems to be this line in the code that's forcing it to be required

terraform/builtin/providers/aws/resource_aws_db_instance.go

Line 57 in 295c924

Required: true,

[stack72]

Just opened PR #3744 that should solve this.

[ghost]

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