Refactor buck external dependencies

Change-Id: Ia4b99493407eb7d4e893804cba6b944f758f085e
diff --git a/apps/l3vpn/BUCK b/apps/l3vpn/BUCK
index 840a1c1..a2dc294 100644
--- a/apps/l3vpn/BUCK
+++ b/apps/l3vpn/BUCK
@@ -1,5 +1,6 @@
 COMPILE_DEPS = [
     '//lib:CORE_DEPS',
+    '//lib:KRYO',
     '//models/l3vpn:onos-models-l3vpn',
     '//apps/config:onos-apps-config',
     '//core/store/serializers:onos-core-serializers',