When VPC is detached from VPN gateway, its VpcAttachment stays in place
just with state changed to "detached". Since terraform was not checking
attachment state, it used to think VPC gateway was still attached.
An attempt to converge the tests into a standard naming scheme
- TestAccAWS for aws tests
- a `_basic` test for each suite, save a few that are quick (Network ACLs, for
example)
This landed in aws-sdk-go yesterday, breaking the AWS provider in many places:
3c259c9586
Here, with much sedding, grepping, and manual massaging, we attempt to
catch Terraform up to the new `awserr.Error` interface world.
Modestas Vainius