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GH-4014: Fix inconsistent usage of MQTT timeouts
Fixes #4014
Also fixes error log with text "... Never happens."
Introduce
completionTimeoutinto aClientManagerabstractionand fix inappropriate usages of the
connectionTimeoutover there.Deprecate the
disconnectCompletionTimeoutin favor ofcompletionTimeoutfor consistency with other similar places.Update MqttAdapterTests.testDifferentQos JUnit test.
TODO: There is still a problematic JUnit test ClientManagerBackToBackTests.testV3ClientManagerReconnect. It passes when executed alone, but fails when executed together with other tests. It seems to me that there is some race condition or improper Spring context initialization. I am not able to sort this out. The test used to pass before this fix, but that was "a pass by an accident" as it logged the problematic exception "... Never happens" and then passed.