Occasional test failure: TestStreamPartitionCountMonitor.testStartStopBehavior

I've seen the following test failure a couple times while running check-all.sh. The test has only failed with Java 8 so far, but I'm not sure if that's always going to be true.

The test should be more reliable.

:samza-core_2.10:test

testStartStopBehavior FAILED
java.lang.AssertionError:
at org.junit.Assert.fail(Assert.java:91)
at org.junit.Assert.assertTrue(Assert.java:43)
at org.junit.Assert.assertFalse(Assert.java:68)
at org.junit.Assert.assertFalse(Assert.java:79)
at org.apache.samza.coordinator.TestStreamPartitionCountMonitor.testStartStopBehavior(TestStreamPartitionCountMonitor.scala:106)

206 tests completed, 1 failed, 1 skipped
:samza-core_2.10:test FAILED