Concurrent logging tests: raise thread exc in main thread
Concurrent logging tests: raise thread exc in main thread

In ConcurrentEventsTest.test_concurrent_events listener1 sometimes has a
wrong log level. However the AssertionError is raised in a thread and
not the main one, so the test seems passing while it should fail.
By storing the exception and raising it later we solve that issue,
allowing to fix the random fail.

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