adding Get by IntentId to LinkResourceService

Change-Id: Ic27daef6e3e55a7d2301f8009432d6c216e1523d
diff --git a/core/api/src/main/java/org/onlab/onos/net/resource/LinkResourceService.java b/core/api/src/main/java/org/onlab/onos/net/resource/LinkResourceService.java
index 1ea5723..973fa97 100644
--- a/core/api/src/main/java/org/onlab/onos/net/resource/LinkResourceService.java
+++ b/core/api/src/main/java/org/onlab/onos/net/resource/LinkResourceService.java
@@ -30,6 +30,8 @@
      */
     Iterable<LinkResourceAllocations> getAllocations();
 
+    LinkResourceAllocations getAllocation(IntentId intentId);
+
     /**
      * Returns all allocated resources to given link.
      *