Refactor OpenstackTelemetry App for better readability

Change-Id: I93353de31fb9671d8670ee44fc248fe7f36ac12b
diff --git a/apps/openstacktelemetry/app/src/test/java/org/onosproject/openstacktelemetry/codec/FlowInfoJsonCodecTest.java b/apps/openstacktelemetry/app/src/test/java/org/onosproject/openstacktelemetry/codec/FlowInfoJsonCodecTest.java
index aed2b76..24fe947 100644
--- a/apps/openstacktelemetry/app/src/test/java/org/onosproject/openstacktelemetry/codec/FlowInfoJsonCodecTest.java
+++ b/apps/openstacktelemetry/app/src/test/java/org/onosproject/openstacktelemetry/codec/FlowInfoJsonCodecTest.java
@@ -61,7 +61,7 @@
     private static final int VLAN_ID = 1;
     private static final int PROTOCOL = 1;
     private static final int FLOW_TYPE = 1;
-    private static final String DEVICE_ID = "foo";
+    private static final String DEVICE_ID = "of:00000000000000a1";
 
     private static final String SRC_IP_ADDRESS = "10.10.10.1";
     private static final int SRC_IP_PREFIX = 24;