* fix route table association by internet gateway per https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_AssociateRouteTable.html
* Route53
- Add test for route table association by internet gateway
- Minor test tweak for Main route table values
TODO: explicitly set the route table main route association
* Route53
- forgot subnet id association test
Co-authored-by: Tony Greising-Murschel <tony@platform.sh>