Fix for Bug ONOS-150:
Replace "dl_address" with "dl_addr" in the database key indexing
to fix a name mismatch.
diff --git a/src/main/java/net/onrc/onos/graph/GraphDBConnection.java b/src/main/java/net/onrc/onos/graph/GraphDBConnection.java
index 53235ab..a883c59 100644
--- a/src/main/java/net/onrc/onos/graph/GraphDBConnection.java
+++ b/src/main/java/net/onrc/onos/graph/GraphDBConnection.java
@@ -66,8 +66,8 @@
 			if (!s.contains("type")) {
 				graph.createKeyIndex("type", Vertex.class);
 			}
-			if (!s.contains("dl_address")) {
-				graph.createKeyIndex("dl_address", Vertex.class);
+			if (!s.contains("dl_addr")) {
+				graph.createKeyIndex("dl_addr", Vertex.class);
 			}
 			if (!s.contains("flow_id")) {
 				graph.createKeyIndex("flow_id", Vertex.class);