Fix LearningSwitchSolution File

Revise judgment on lack of ARP protocols

Change-Id: Ie58060751830eb827aabe3c03a0f1a0610fa81a0
diff --git a/apps/learning-switch/src/main/java/org/onosproject/learningswitch/LearningSwitchSolution.java b/apps/learning-switch/src/main/java/org/onosproject/learningswitch/LearningSwitchSolution.java
index 8dd07fd..875e004 100644
--- a/apps/learning-switch/src/main/java/org/onosproject/learningswitch/LearningSwitchSolution.java
+++ b/apps/learning-switch/src/main/java/org/onosproject/learningswitch/LearningSwitchSolution.java
@@ -155,7 +155,7 @@
              * and do nothing with the packet. actLikeSwitch can only process IPV4 packets.
              */
             Short type = pc.inPacket().parsed().getEtherType();
-            if (type != Ethernet.TYPE_IPV4) {
+            if (type != Ethernet.TYPE_IPV4 && type != Ethernet.TYPE_ARP) {
                 return;
             }