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

Change-Id: I0a1aea4bdb5d305c50273e6ff749fe71bd2a295a
diff --git a/core/store/dist/src/main/java/org/onosproject/store/flow/impl/DistributedFlowRuleStore.java b/core/store/dist/src/main/java/org/onosproject/store/flow/impl/DistributedFlowRuleStore.java
index 368c06d..e21caa1 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/flow/impl/DistributedFlowRuleStore.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/flow/impl/DistributedFlowRuleStore.java
@@ -861,7 +861,7 @@
             try {
                 // compute a mapping from node to the set of devices whose flow entries it should backup
                 Map<NodeId, Set<DeviceId>> devicesToBackupByNode = Maps.newHashMap();
-                flowEntries.keySet().stream().forEach(deviceId -> {
+                flowEntries.keySet().forEach(deviceId -> {
                     List<NodeId> backupNodes = getBackupNodes(deviceId);
                     backupNodes.forEach(backupNode -> {
                             if (lastBackupTimes.getOrDefault(new BackupOperation(backupNode, deviceId), 0L)
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 =
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/PartitionManager.java b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/PartitionManager.java
index bedac18..3150363 100644
--- a/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/PartitionManager.java
+++ b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/PartitionManager.java
@@ -89,7 +89,6 @@
         metadataService.addListener(metadataListener);
         currentClusterMetadata.get()
                        .getPartitions()
-                       .stream()
                        .forEach(partition -> partitions.put(partition.getId(), new StoragePartition(partition,
                                messagingService,
                                clusterService,