Moved Tunnel subsystem to ONOS core incubator area.

Change-Id: I03f90b068013fbf0490af5277b33459ccc0514ec
diff --git a/providers/pom.xml b/providers/pom.xml
index 7d9f38f..d59b2b6 100644
--- a/providers/pom.xml
+++ b/providers/pom.xml
@@ -45,6 +45,10 @@
             <groupId>org.onosproject</groupId>
             <artifactId>onos-api</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.onosproject</groupId>
+            <artifactId>onos-incubator-api</artifactId>
+        </dependency>
 
         <dependency>
             <groupId>org.onosproject</groupId>