Fix issues found by FindBugs: DMI_INVOKING_HASHCODE_ON_ARRAY

http://findbugs.sourceforge.net/bugDescriptions.html#DMI_INVOKING_HASHCODE_ON_ARRAY

Change-Id: I948f93b5aa94af596cbf98b433eeee8fdaad79e5
diff --git a/src/main/java/net/onrc/onos/core/packet/BSNPROBE.java b/src/main/java/net/onrc/onos/core/packet/BSNPROBE.java
index e411b7e..c284aca 100644
--- a/src/main/java/net/onrc/onos/core/packet/BSNPROBE.java
+++ b/src/main/java/net/onrc/onos/core/packet/BSNPROBE.java
@@ -151,8 +151,8 @@
     public int hashCode() {
         final int prime = 883;
         int result = super.hashCode();
-        result = prime * result + srcMac.hashCode();
-        result = prime * result + dstMac.hashCode();
+        result = prime * result + Arrays.hashCode(srcMac);
+        result = prime * result + Arrays.hashCode(dstMac);
         result = prime * result + (int) (srcSwDpid >> 32) + (int) srcSwDpid;
         result = prime * result + srcPortNo;
         return result;