Grpc dns/passthrough package made private in 1.25 release, but etcd use those in clientv3/balancer/balancer.go:30

[leaxoy]

No description provided.

[owend]

Duplicate of #11336 This issue description is a better description of the problem though.

This will be fixed by grpc 1.25.1 release putting the dns/passthrough packages back where they used to be. However, etcd shouldn't use those internal grpc packages.

[stale]

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