[CORD-3180] Setting app_id as mandatory and handling 409 error

Change-Id: Ie712d1e8e6bef402c63893f070ebb5de9f01e518
diff --git a/samples/apps.yaml b/samples/apps.yaml
index d923788..4594586 100644
--- a/samples/apps.yaml
+++ b/samples/apps.yaml
@@ -44,6 +44,7 @@
     cord-config:
       type: tosca.nodes.ONOSApp
       properties:
+        app_id: org.opencord.cord-config
         name: cord-config
         url: https://oss.sonatype.org/content/repositories/public/org/opencord/cord-config/1.4.0-SNAPSHOT/cord-config-1.4.0-20180604.071543-275.oar
         version: 1.4.0.SNAPSHOT