Refactor bucklets to share ONOS buck definition files

Change-Id: Ifb4bc87b264eea9c660f0e053c27822bb9922b78
diff --git a/bucklets/onos.bucklet b/bucklets/onos.bucklet
index 109b7dd..89976f5 100644
--- a/bucklets/onos.bucklet
+++ b/bucklets/onos.bucklet
@@ -9,10 +9,7 @@
 RESOURCES_ROOT = 'src/main/resources/'
 TEST_RESOURCES_ROOT = 'src/test/resources/'
 
-
-ONOS_GROUP_ID = 'org.onosproject'
-ONOS_VERSION = '1.7.0-SNAPSHOT'
-ONOS_ARTIFACT_BASE = 'onos-'
+include_defs('//onos.defs')
 
 def _get_name():
     base_path = get_base_path()