ONOS-2381 Fixing intent purge command

We need to remove the current value.

Change-Id: Ib15f9b097e3df096b45367012d067973436e1d85
diff --git a/core/api/src/main/java/org/onosproject/net/intent/IntentData.java b/core/api/src/main/java/org/onosproject/net/intent/IntentData.java
index 6ac200f..e24e14e 100644
--- a/core/api/src/main/java/org/onosproject/net/intent/IntentData.java
+++ b/core/api/src/main/java/org/onosproject/net/intent/IntentData.java
@@ -281,6 +281,7 @@
             return true;
 
         case PURGE_REQ:
+            // TODO we should enforce that only WITHDRAWN intents can be purged
             return true;
 
         case COMPILING: