AWS::EC2::VPCCidrBlock - Enable extraction of CIDR blocks

[dpantke]

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1. Title

AWS::EC2::VPCCidrBlock - add CIDRv4 and CIDRv6 attributes

2. Scope of request

Need to be able to query the IPv4 and IPv6 CIDR ranges from a AWS::EC2::VPCCidrBlock. Currently, only the association itself is returned. The IPv6 return is especially important, and AWS generates this prefix internally and so there's no way of knowing until resource create time.

3. Expected behavior

GetAtt calls for the Ipv4 and IPv6 prefixes returns a valid CIDR from the VPC.

4. Suggest specific test cases

Nothing specific, just generate a new CIDR association and see if the CIDR's are correct.

5. Helpful Links to speed up research and evaluation

6. Category (required) - Will help with tagging and be easier to find by other users to +1

4. Networking & Content (VPC, Route53, API GW,...)

7. Any additional context (optional)