Anthony Romano a39107a3b8 clientv3: use waitgroup to wait for substream goroutine teardown ...

When a grpc watch stream is torn down, it will join on its logical substream
goroutines by waiting for each to close a channel. This doesn't guarantee
the substream is fully exited, though, but only about to exit and can be
waiting to resume even after Watch.Close finishes. Instead, use a
waitgroup.Done at the very end of the substream defer.

Fixes #7573

2017-03-22 23:27:26 -07:00

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