Added wrapper application of openstack4j

It is impossible to use openstack4j directly from ONOS apps
due to the Jersey version conflict.

Change-Id: I2df32430de42d627b03e0a2f8d8d2b9067ad3e14
diff --git a/apps/pom.xml b/apps/pom.xml
index 0aa0716..789cc5a 100644
--- a/apps/pom.xml
+++ b/apps/pom.xml
@@ -68,6 +68,7 @@
         <module>vpls</module>
         <module>openstacknode</module>
         <module>openstacknetworking</module>
+        <module>openstack4j</module>
   </modules>
 
     <properties>