Use Collection#forEach() instead of Stream#forEach() for simplicity

Change-Id: I0a1aea4bdb5d305c50273e6ff749fe71bd2a295a
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 3915d8c..9a951a6 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
@@ -321,7 +321,7 @@
 
         List<GroupEvent> eventsAfterAdds = delegate.eventsSeen();
         assertThat(eventsAfterAdds, hasSize(2));
-        eventsAfterAdds.stream().forEach(event -> assertThat(event.type(), is(GroupEvent.Type.GROUP_ADD_REQUESTED)));
+        eventsAfterAdds.forEach(event -> assertThat(event.type(), is(GroupEvent.Type.GROUP_ADD_REQUESTED)));
         delegate.resetEvents();
 
         GroupOperation opAdd =