[GitHub] flink issue #5771: [FLINK-9094] [tests] Harden AccumulatorLiveITCase

[tillrohrmann]

Github user tillrohrmann commented on the issue:

    https://github.com/apache/flink/pull/5771
  
    I've addressed your comments by introducing a `CheckedThread` which does a 
blocking job submission @zentol.


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