Adding property to pickup application name from web.xml

modules/samples/virtual_firealarm/src/org.wso2.carbon.device.mgt.iot.sample.virtual.firealarm.service.impl/src/main/webapp/WEB-INF/web.xml

@@ -56,6 +56,10 @@
     <context-param>
             <param-name>managed-api-context-template</param-name>
             <param-value>/virtual_firealarm/{version}</param-value>
+    </context-param>
+    <context-param>
+            <param-name>managed-api-application</param-name>
+            <param-value>virtual_firealarm</param-value>
     </context-param>
 	<context-param>
 		<param-name>managed-api-isSecured</param-name>