Replace Stream#forEach() with Collection#forEach()

Change-Id: I2b261c3d91d345907b165bd61eb7b6c45011c247
diff --git a/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/virtualport/impl/VirtualPortManager.java b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/virtualport/impl/VirtualPortManager.java
index 522e540..ede595f 100644
--- a/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/virtualport/impl/VirtualPortManager.java
+++ b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/virtualport/impl/VirtualPortManager.java
@@ -191,7 +191,7 @@
     public VirtualPort getPort(MacAddress mac) {
         checkNotNull(mac, MAC_NOT_NULL);
         List<VirtualPort> vPorts = new ArrayList<>();
-        vPortStore.values().stream().forEach(p -> {
+        vPortStore.values().forEach(p -> {
             if (p.macAddress().equals(mac)) {
                 vPorts.add(p);
             }