Support additional CIDRs in aws_vpc

[mmacfadden]

AWS now allows users to add auxiliary cidrs to the VPC to allow for expansion of the address space in the VPC. The following announcement from AWS details the funcitonality:

https://aws.amazon.com/about-aws/whats-new/2017/08/amazon-virtual-private-cloud-vpc-now-allows-customers-to-expand-their-existing-vpcs/

Can the aws_vpc resource be updated to allow for additional CIDRs?

[hashibot]

This issue has been automatically migrated to hashicorp/terraform-provider-aws#2841 because it looks like an issue with that provider. If you believe this is not an issue with the provider, please reply to this issue and let us know.

[ghost]

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