Refactor bucklets to share ONOS buck definition files

Change-Id: Ifb4bc87b264eea9c660f0e053c27822bb9922b78
diff --git a/bucklets/onos_app.bucklet b/bucklets/onos_app.bucklet
index a50b200..20c6ce5 100644
--- a/bucklets/onos_app.bucklet
+++ b/bucklets/onos_app.bucklet
@@ -1,9 +1,6 @@
-ONOS_ORIGIN = 'ON.Lab'
-ONOS_GROUP_ID = 'org.onosproject'
-ONOS_VERSION = '1.7.0-SNAPSHOT'
+include_defs('//onos.defs')
+
 DEFAULT_APP_CATEGORY = 'Utility'
-ONOS_ARTIFACT_BASE = 'onos-'
-APP_PREFIX = ONOS_GROUP_ID + '.'
 
 import os.path