providers/aws: ignore ec2 root devices #877
Merged
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fixes #859
EC2 root block devices are attached automatically at launch [1] and show
up in DescribeInstances responses from then on. By skipping these when
recording state, Terraform can avoid thinking there should be block
device changes when there are none.
Note this requires that mitchellh/goamz#214 land
first so the proper field is exposed.
[1] http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/RootDeviceStorage.html