Fix unsubscribe during inflight subscribe in goroutine #372
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This fixes a case when unsubscribe command received during a subscribe command is being processed in a separate goroutine.
For example, this may be hit when
client_concurrency> 1 in Centrifugo.We now wait for subscribe completion before processing unsubscribe. Not doing this could result in
already subscribederror when processing subscribe request in a separate goroutine and sequence likesubscribe -> unsubscribe -> subscribehappens quickly.