set HttpAsyncClientSingleton.HTTPC_CLIENT = null on shutdown #84
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when using the NextcloudConnector, shutting it down with NextcloudConnector.shutdown() and using it afterwards again in the same JVM (for example when executing multiple integration-tests after each other) the HTTPC_CLIENT does not get initialized because its not null. the HTTPC_CLIENT-instance is in the STOPPED-state, so further executions with the client dont work.
PR: cleanup singleton-instance of HttpAsyncClientSingleton.HTTPC_CLIENT by setting the HTTP_CLIENT to null on ConnectorCommon.shutdown()