Add events to DHCP L2 relay application.

The app will send events regarding the DHCP state machine.

Change-Id: I0a20d74e1a1f3b5359509611e9cf1f59495153d5
diff --git a/src/test/java/org/opencord/dhcpl2relay/DhcpL2RelayTest.java b/src/test/java/org/opencord/dhcpl2relay/DhcpL2RelayTest.java
index 228d59f..f3aea3e 100755
--- a/src/test/java/org/opencord/dhcpl2relay/DhcpL2RelayTest.java
+++ b/src/test/java/org/opencord/dhcpl2relay/DhcpL2RelayTest.java
@@ -21,6 +21,7 @@
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
+import org.onlab.junit.TestUtils;
 import org.onlab.osgi.ComponentContextAdapter;
 import org.onlab.packet.ChassisId;
 import org.onlab.packet.DHCP;
@@ -33,6 +34,7 @@
 import org.onlab.packet.VlanId;
 import org.onlab.packet.dhcp.DhcpOption;
 import org.onosproject.cfg.ComponentConfigService;
+import org.onosproject.common.event.impl.TestEventDispatcher;
 import org.onosproject.core.CoreServiceAdapter;
 import org.onosproject.mastership.MastershipServiceAdapter;
 import org.onosproject.net.AnnotationKeys;
@@ -106,6 +108,7 @@
         dhcpL2Relay.subsService = new MockSubService();
         dhcpL2Relay.hostService = new MockHostService();
         dhcpL2Relay.mastershipService = new MockMastershipService();
+        TestUtils.setField(dhcpL2Relay, "eventDispatcher", new TestEventDispatcher());
         dhcpL2Relay.activate(new ComponentContextAdapter());
     }