Intermittent primitive test failures in Buck

Users have been experiencing intermittent test failures since the Atomix 2.x upgrade. These failures seem to always occur in buck test runs and appear to relate to primitive events. Typically, either an incorrect event will be received or an event that shouldn't have been seen will be received. Test failures can be reproduced by simply running buck test core/store/primitives:onos-core-primitives until a failure, or to run an individual test buck test core/store/primitives:onos-core-primitives --test-selectors 'org.onosproject.store.primitives.resources.impl.AtomixConsistentMapTest#testMapListeners'