Commits on Apr 26, 2017

1. Ignore AMI updates on etcd/master nodes …

   Currently if a new version of CoreOS comes out on a user's configured
   channel after they've already deployed, and they re-run terraform apply,
   Terraform will detect the new AMI, and when reconciling desired state,
   it will attempt to destroy existing nodes to update the AMI.
   
   In order to avoid this, I added a ignore_changes to both the etcd node
   resource, and the master launch configuration resource, to avoid
   updating masters/etcd nodes if the AMI changes.
   
   Longer term, I would expect the Container Linux Update Operator, or a
   terraform operator could resolve this, but this seems like a reasonable
   change to prevent accidental destruction of a cluster.
   
   Previously this change also set prevent_destroy, but that cannot be
   parameterized with vars, so it was removed.

   Chance Zibolski committed Apr 26, 2017
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