Clients can throw GRPC::Unavailable when the server is restarted

On some occasions, restarting the server causes clients to throw GRPC::Unavailable (14:Endpoint read failed). We suspect that is has something to do with the underlying channel of a client stub. Calling channel.connectivity_state(true) forces the channel to reconnect if it's in IDLE state, for healthy clients it changes the state to READY, for unhealthy ones it is always IDLE.

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