[ONOS-6266] 'garbageCollect' is not working for groups after ONOS restart

Change-Id: I1e2a5c78d64f8f5cec6352011f3fc6362c9937e5
diff --git a/core/store/dist/src/test/java/org/onosproject/store/group/impl/DistributedGroupStoreTest.java b/core/store/dist/src/test/java/org/onosproject/store/group/impl/DistributedGroupStoreTest.java
index e6d92ec..3e25bd6 100644
--- a/core/store/dist/src/test/java/org/onosproject/store/group/impl/DistributedGroupStoreTest.java
+++ b/core/store/dist/src/test/java/org/onosproject/store/group/impl/DistributedGroupStoreTest.java
@@ -132,7 +132,7 @@
         groupStoreImpl.clusterCommunicator = new ClusterCommunicationServiceAdapter();
         groupStoreImpl.mastershipService = new MasterOfAll();
         groupStoreImpl.cfgService = new ComponentConfigAdapter();
-        groupStoreImpl.activate();
+        groupStoreImpl.activate(null);
         groupStore = groupStoreImpl;
         auditPendingReqQueue =
                 TestUtils.getField(groupStoreImpl, "auditPendingReqQueue");