Etcd migration playbook fails if no etcd snapshot has been created
Issue
When running the etcd migration playbook, one of the pre-checks is to ensure etcd has created a snapshot file.
Fails with message
Before the migration can proceed the etcd member must write down at least one snapshot under /var/lib/etcd/member/snap directory
On a fresh environment etcd might not have created this snapshot yet and therefore migration playbook fails.
Environment
OpenShift 3.6 (upgraded from 3.5)
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