Fixed ONOS-2051 by eliminating treatment and priority from flow id/cookie.

FIxed NPE in port stats collection.

Change-Id: I30954d31c39be959e84fa74f1c4e781d5767f303

@@ -330,11 +330,12 @@ public class DefaultFlowRule implements FlowRule {
      * @see java.lang.Object#equals(java.lang.Object)
      */
     public int hashCode() {
-        return Objects.hash(deviceId, selector, priority, tableId, payLoad);
+        return Objects.hash(deviceId, selector, tableId, payLoad);
     }
 
-    public int hash() {
-        return Objects.hash(deviceId, selector, treatment, tableId, payLoad);
+    //FIXME do we need this method in addition to hashCode()?
+    private int hash() {
+        return Objects.hash(deviceId, selector, tableId, payLoad);
     }
 
     @Override

@@ -215,7 +215,7 @@ public class OpenFlowDeviceProvider extends AbstractProvider implements DevicePr
 
         for (OFPortStatsEntry entry : entries) {
             try {
-                if (entry.getPortNo().getPortNumber() < 0) {
+                if (entry.getPortNo() == null || entry.getPortNo().getPortNumber() < 0) {
                     continue;
                 }
                 DefaultPortStatistics.Builder builder = DefaultPortStatistics.builder();