Fix IndexOutOfBounds exception in BaseAnalysisEngineController
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                 Key: UIMA-1630
                 URL: https://issues.apache.org/jira/browse/UIMA-1630
             Project: UIMA
          Issue Type: Bug
          Components: Async Scaleout
            Reporter: Jerry Cwiklik
            Assignee: Jerry Cwiklik
             Fix For: 2.3AS


There seems to be a synchronization problem in BaseAnalysisEngineController 
leading to the exception. The aggregate controller attempts to stop its 
colocated delegates and fails with IndexOutOfBounds. It looks like one thread 
is trying to stop, while another is cleaning up a HashMap. Need to synchronize 
these activities.

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