Unit tests for Neighbour Resolution Service.

This patch involves a refactoring to split the neighbour actions
implementation out from the main NeighbourResolutionManager class.

ONOS-5276

Change-Id: I082b401ae9046a1ed983610af05da112bd2683d3
diff --git a/core/api/src/test/java/org/onosproject/net/edge/EdgePortServiceAdapter.java b/core/api/src/test/java/org/onosproject/net/edge/EdgePortServiceAdapter.java
new file mode 100644
index 0000000..d38f05e
--- /dev/null
+++ b/core/api/src/test/java/org/onosproject/net/edge/EdgePortServiceAdapter.java
@@ -0,0 +1,64 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.net.edge;
+
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.flow.TrafficTreatment;
+
+import java.nio.ByteBuffer;
+import java.util.Optional;
+
+/**
+ * Adapter for tests involving the edge port service.
+ */
+public class EdgePortServiceAdapter implements EdgePortService {
+    @Override
+    public void addListener(EdgePortListener listener) {
+
+    }
+
+    @Override
+    public void removeListener(EdgePortListener listener) {
+
+    }
+
+    @Override
+    public boolean isEdgePoint(ConnectPoint point) {
+        return false;
+    }
+
+    @Override
+    public Iterable<ConnectPoint> getEdgePoints() {
+        return null;
+    }
+
+    @Override
+    public Iterable<ConnectPoint> getEdgePoints(DeviceId deviceId) {
+        return null;
+    }
+
+    @Override
+    public void emitPacket(ByteBuffer data, Optional<TrafficTreatment> treatment) {
+
+    }
+
+    @Override
+    public void emitPacket(DeviceId deviceId, ByteBuffer data, Optional<TrafficTreatment> treatment) {
+
+    }
+}