[SPARK-19891][SS] Await Batch Lock notified on stream execution exit #17231
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What changes were proposed in this pull request?
We need to notify the await batch lock when the stream exits early e.g., when an exception has been thrown.
How was this patch tested?
Current tests that throw exceptions at runtime will finish faster as a result of this update.
@zsxwing
Please review http://spark.apache.org/contributing.html before opening a pull request.