NullDeviceProvider now takes configurations for :

  - Number of devices per ONOS instance.
  - Number of ports on the devices. This value is global.

The islands created by each instances' providers are joined together
in a chain (circle).

Reference : ONOS-860

Change-Id: I875ad1fbc1d4441869373c25de2ae5b62838e0d4
diff --git a/providers/null/device/pom.xml b/providers/null/device/pom.xml
index 18bfd3dd..345f551 100644
--- a/providers/null/device/pom.xml
+++ b/providers/null/device/pom.xml
@@ -31,4 +31,11 @@
 
     <description>ONOS Null protocol device provider</description>
 
+    <dependencies>
+      <dependency>
+        <groupId>org.osgi</groupId>
+        <artifactId>org.osgi.compendium</artifactId>
+      </dependency>
+    </dependencies>
+
 </project>