Problem is that test testReschedule sometimes pass and sometimes fails.

Running org.opendaylight.groupbasedpolicy.util.SingletonTaskTest
Tests run: 6, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 0.591 sec <<< FAILURE! - in org.opendaylight.groupbasedpolicy.util.SingletonTaskTest
testReschedule(org.opendaylight.groupbasedpolicy.util.SingletonTaskTest) Time elapsed: 0.064 sec <<< FAILURE!
java.lang.AssertionError: Check that time passed appropriately: 54428957
at org.junit.Assert.fail(Assert.java:88)
at org.junit.Assert.assertTrue(Assert.java:41)
at org.opendaylight.groupbasedpolicy.util.SingletonTaskTest.testReschedule(SingletonTaskTest.java:122)

Results :

Failed tests:
SingletonTaskTest.testReschedule:122 Check that time passed appropriately: 54428957