* Update Shippable integration test groups.
* Update integration test group aliases.
* Rebalance AWS and Azure tests with extra group.
* Rebalance Windows tests with another group.
* New module: ec2_vpc_vpn_facts
* Add integration tests for ec2_vpc_vpn_facts and the IAM permissions
* Add retry to VPC removal
* Use unique name for VGW
* Always clean up after tests and add retries