Adding learning-switch application to apps pom.xml

Change-Id: Ie4fc2e92ce84680ba8a5bcc93bde17568829e172

@@ -77,6 +77,7 @@
         <module>bmv2-demo</module>
         <module>yms</module>
         <module>rabbitmq</module>
+        <module>learning-switch</module>
     </modules>