Fix flaky tests in CollectionUtilsUnitTests #134
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In
org.springframework.data.gemfire.util.CollectionUtilsUnitTests, the testsiterableOfEnumeration(),iterableOfIterator()are all flaky due to the non-deterministic property ofHashSet(please refer document). It stores value in non-determined order, so it is possible to report exception when invokingcontainsExactly(). I fixed by changing theHashSettoLinkedHashSet, which guarantees the order of value added into thesetand eliminates the flakiness of these two tests.