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

Change-Id: I0a1aea4bdb5d305c50273e6ff749fe71bd2a295a
diff --git a/core/net/src/main/java/org/onosproject/net/statistic/impl/FlowStatisticManager.java b/core/net/src/main/java/org/onosproject/net/statistic/impl/FlowStatisticManager.java
index fce7780..487e9af 100644
--- a/core/net/src/main/java/org/onosproject/net/statistic/impl/FlowStatisticManager.java
+++ b/core/net/src/main/java/org/onosproject/net/statistic/impl/FlowStatisticManager.java
@@ -601,7 +601,7 @@
     }
 
     private void checkLoadValidity(Set<FlowEntry> current, Set<FlowEntry> previous) {
-        current.stream().forEach(c -> {
+        current.forEach(c -> {
             FlowEntry f = previous.stream().filter(p -> c.equals(p)).
                     findAny().orElse(null);
             if (f != null && c.bytes() < f.bytes()) {