ONOS-989 - Add key to toString() methods of intents

Change-Id: Ic82b25e26ab7fb767f3ca571ef7594679c501ba5
diff --git a/core/api/src/main/java/org/onosproject/net/intent/MultiPointToSinglePointIntent.java b/core/api/src/main/java/org/onosproject/net/intent/MultiPointToSinglePointIntent.java
index 7de52a5..64c4fd8 100644
--- a/core/api/src/main/java/org/onosproject/net/intent/MultiPointToSinglePointIntent.java
+++ b/core/api/src/main/java/org/onosproject/net/intent/MultiPointToSinglePointIntent.java
@@ -149,6 +149,7 @@
     public String toString() {
         return MoreObjects.toStringHelper(getClass())
                 .add("id", id())
+                .add("key", key())
                 .add("appId", appId())
                 .add("resources", resources())
                 .add("selector", selector())