Fixing topology related interface/class tree

- (Mutable)Topology no longer implements ImmutableTopology

    --- BaseTopology (was ImmutableTopology)
     |
     +-- ImmutableTopology (new)
     |
     +-- MutableTopology (was Topology)
       |
       +-- RefreshableTopology
       |
       +-- TopologyInternal
            This interface is placed in wrong place. To be fixed later.

Change-Id: Ifa9defcc7c0fc22bba19977fe4ea57eaf792275e
diff --git a/src/main/java/net/onrc/onos/core/packetservice/SinglePacketOutNotification.java b/src/main/java/net/onrc/onos/core/packetservice/SinglePacketOutNotification.java
index 0521434..e9bb7a4 100644
--- a/src/main/java/net/onrc/onos/core/packetservice/SinglePacketOutNotification.java
+++ b/src/main/java/net/onrc/onos/core/packetservice/SinglePacketOutNotification.java
@@ -1,6 +1,6 @@
 package net.onrc.onos.core.packetservice;
 
-import net.onrc.onos.core.topology.Topology;
+import net.onrc.onos.core.topology.MutableTopology;
 
 import com.google.common.collect.HashMultimap;
 import com.google.common.collect.Multimap;
@@ -72,7 +72,7 @@
 
     @Override
     public Multimap<Long, Short> calculateOutPorts(
-            Multimap<Long, Short> localPorts, Topology topology) {
+            Multimap<Long, Short> localPorts, MutableTopology mutableTopology) {
         Multimap<Long, Short> outPorts = HashMultimap.create();
 
         if (localPorts.containsEntry(outSwitch, outPort)) {