Fix AWS IMDS discovery of ipv6 and ipv4 addresses #3
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Testing in kubernetes/kops#16722 revealed we were returning an error when ipv6 wasn't found, instead of falling back to ipv4
https://storage.googleapis.com/kubernetes-jenkins/pr-logs/pull/kops/16722/pull-kops-e2e-k8s-aws-calico/1819545673658273792/artifacts/13.52.61.91/etcd.log
error querying ec2 metadata service (for ipv6): operation error ec2imds: GetMetadata, http response error StatusCode: 404, request to EC2 IMDS failed/cc @hakman