SAMZA-1191; Fixed flaky test: TestExponentialSleepStrategy testThread…

…InterruptInRetryLoop

It's possible that the interruptee thread (see `#interruptedThread`) gets pre-empted before it has a chance to run the operation (increment `iterations`) and then gets interrupted, causing these assertions to fail.

I think these assertions also aren't critical for the tests which I presume want to test interrupt propagation behavior, so removing them in this change.

vjagadish1989 & xinyuiscool, please take a look.

Author: Prateek Maheshwari <pmaheshw@linkedin.com>

Reviewers: Jagadish <jagadish@apache.org>

Closes apache#113 from prateekm/flaky-ess-test-fix

samza-core/src/test/scala/org/apache/samza/util/TestExponentialSleepStrategy.scala

@@ -140,8 +140,6 @@ class TestExponentialSleepStrategy {
         (exception, loop) => throw exception
       )
     }
-    assertEquals(1, iterations)
-    assertEquals(1, loopObject.sleepCount)
     assertEquals(classOf[InterruptedException], exception.get.getClass)
   }
 
@@ -155,8 +153,6 @@ class TestExponentialSleepStrategy {
         (exception, loop) => throw exception
       )
     }
-    assertEquals(1, iterations)
-    assertEquals(0, loopObject.sleepCount)
     assertEquals(classOf[InterruptedException], exception.get.getClass)
   }
 }