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Support proxying to etcd v3 storage on buster or later
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Description

At the moment, we run nginx in front of etcd to manage authn/authz, and that only works with the v2 storage right now because we have no grpc support.

Newer nginx versions (like the one on debian buster) do support grpc proxying and thus we should start supporting it too, possibly before we send read traffic to the new etcd cluster in codfw.