This workaround is originally from 71b30c633f.
According to the commit message from Mitchell Hashimoto:
So I think the AWS API is just broken here. In the case that the state
doesn't update, just assume it did after 5 seconds.
Based on my experience, this AWS API is still broken in the same way.
The timeout was later increased from 5 seconds to 10 seconds in
265cc4fffa.
The timeout (but not the timer) was removed inexplicably in GH-1325.
The symptom is this error from `terraform apply`:
aws_internet_gateway.test: Error waiting for internet gateway (igw-553b4731) to attach: timeout while waiting for state to become '[available]'
followed by all subsequent `terraform apply` commands failing with this error:
aws_internet_gateway.test: Resource.AlreadyAssociated: resource igw-553b4731 is already attached to network vpc-61bc7606
a86d766bd2