AWS: empty snapshot names with USE_CLAIM_NAME=true

[mrtyler]

I've been running k8s-snapshots for a few months in a kops-managed Kubernetes cluster on AWS.

I pulled the latest k8s-snapshots Docker image. I believe I went from the 2018-02-09 image c5da4196dfa7 to the 2018-02-18 image d4c54dea2402 (current latest build).

With the old version and USE_CLAIM_NAME=true, my Snapshot names looked as expected. With the new version, Snapshot names are empty. I believe the k8s-snapshots version change is the only thing that changed in my cluster between the desired behavior and the buggy behavior.

If I have it right, the two changes merged between the old version and the new version are #51 --
which looks to be Google Cloud-only -- and #50. @wadahiro do you think this could be related to your boto3 changes?

[mrtyler]

I reverted the changes from #50, rebuilt the Docker image, and deployed it to my cluster. Snapshot names have returned.

In case it is useful to anyone, my image -- built from d4af616 minus #50, or the equivalent of c66eedb -- is available at https://hub.docker.com/r/mrtyler/k8s-snapshots/.