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v3beta endpoints are available since etcd 3.3 while current platforms (Ubuntu Bionic, Focal; CentOS 8) provide 3.2. Also, not to annoy existing clients and be a good SemVer citizen, let's switch the default to its previous value. It's configurable so new users can still switch it to use v3beta (or v3 with 3.4). Fixes #41
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