awsup: fix shadowed var when looking for etcd cluster name

[diversario]

Variable etcdClusterName is being reset inside the loop, resulting in the outer etcdClusterName never changing from "".

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[johngmyers]

/retest

[justinsb]

Thanks for spotting this @diversario

/approve
/lgtm
/retest

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: diversario, justinsb

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[rifelpet]

/test pull-kops-e2e-kubernetes-aws