Fix bug in race condition between the shutdown of a client and the connect of another with same clientId #561
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…nnect of another with same clientId
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This PR fixes #553 (comment) when a thread is processing the loose of client connection and start the clean up of session from the registry, another thread is processing the CONNECT from the same client (with same clientId), this second thread has to retrieve the connection from the registry in only one step, avoiding to do a
check-and-getbut doing only a get, then checking for presence or not