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https://github.com/etcd-io/etcd.git
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1c401581e3
Before this change:
```
gwmux, err = sctx.registerGateway([]grpc.DialOption{grpc.WithInsecure()})
if err != nil { return err; }
```
caused the Etcd.Serve() method finish without sctx.serversC channel being closed.
The code closing Etcd got stuck waiting for all the servers to be running.
Signed-off-by: Piotr Tabor <ptab@google.com>