Fixed annotation handling.

- Store as SparseAnnotations internally and convert to Annotations
  when merging multiple provider supplied annotations.

Change-Id: I82fe159b536b3e7344a33e09792f6a3473fb3500
diff --git a/core/api/src/test/java/org/onlab/onos/net/topology/DefaultTopologyEdgeTest.java b/core/api/src/test/java/org/onlab/onos/net/topology/DefaultTopologyEdgeTest.java
index 6c3c112..5d64c83 100644
--- a/core/api/src/test/java/org/onlab/onos/net/topology/DefaultTopologyEdgeTest.java
+++ b/core/api/src/test/java/org/onlab/onos/net/topology/DefaultTopologyEdgeTest.java
@@ -50,5 +50,4 @@
                                   new DefaultTopologyEdge(V2, V1, L2))
                 .testEquals();
     }
-
-}
\ No newline at end of file
+}