Fix to update floating IP association/disassociation in OpenstackInterfaceServce

Change-Id: I04b96109296125849bc91d5bc92e476338749935
diff --git a/apps/openstackinterface/app/pom.xml b/apps/openstackinterface/app/pom.xml
index 7bbeca8..859d0fe 100644
--- a/apps/openstackinterface/app/pom.xml
+++ b/apps/openstackinterface/app/pom.xml
@@ -83,5 +83,10 @@
             <groupId>org.onosproject</groupId>
             <artifactId>onlab-misc</artifactId>
         </dependency>
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>2.4</version>
+        </dependency>
     </dependencies>
 </project>