Added TierConstraint and MeteredConstraint

Change-Id: Iadc50c98dc0ba7092313f880df8055ab0e401c29
diff --git a/core/common/src/test/resources/org/onosproject/codec/impl/TierConstraint.json b/core/common/src/test/resources/org/onosproject/codec/impl/TierConstraint.json
new file mode 100644
index 0000000..4da785d
--- /dev/null
+++ b/core/common/src/test/resources/org/onosproject/codec/impl/TierConstraint.json
@@ -0,0 +1,6 @@
+{
+  "type":"TierConstraint",
+  "inclusive": true,
+  "costType": "ORDER",
+  "tiers": [3, 2, 1]
+}