Clean up routes when the ONOS node they were sourced from goes down

Change-Id: I1b70e087b64404bf92e6251d18f3c85791e30583
diff --git a/incubator/net/pom.xml b/incubator/net/pom.xml
index da78b6f..cc5846e 100644
--- a/incubator/net/pom.xml
+++ b/incubator/net/pom.xml
@@ -106,6 +106,12 @@
             <artifactId>concurrent-trees</artifactId>
             <version>2.6.0</version>
         </dependency>
+
+        <dependency>
+            <groupId>org.onosproject</groupId>
+            <artifactId>onos-core-serializers</artifactId>
+            <version>${project.version}</version>
+        </dependency>
     </dependencies>
 
     <build>