[Blackbird] Fixing Intent purge case (ONOS-1207)

Master needs to remove from the current map.

Change-Id: I30eccbe188997949ef2d63d6dbd37b0d8d4b3f5e
diff --git a/core/api/src/main/java/org/onosproject/net/intent/IntentState.java b/core/api/src/main/java/org/onosproject/net/intent/IntentState.java
index 73b337c..555fe4b 100644
--- a/core/api/src/main/java/org/onosproject/net/intent/IntentState.java
+++ b/core/api/src/main/java/org/onosproject/net/intent/IntentState.java
@@ -92,5 +92,14 @@
      * Signifies that the intent has failed compiling, installing or
      * recompiling states.
      */
-    FAILED //TODO consider renaming to UNSAT.
+    FAILED, //TODO consider renaming to UNSAT.
+
+    /**
+     * Indicates that the intent should be purged from the database.
+     * <p>
+     * Note: This operation will only be performed if the intent is already
+     * in WITHDRAWN or FAILED.
+     * </p>
+     */
+    PURGE_REQ
 }