Fixed Issue #207:
Implement remaining API for getting flow state

NOTE: The implementation of the API backend is sub-optimal,
but should be sufficient for now:
  We fetch all flows, and then return only the subset that match
  the query conditions.
  We should use the appropriate Titan/Gremlin query to filter-out
  the flows as appropriate.

Estimated: 2D
Actual: 1D
diff --git a/src/main/java/net/onrc/onos/util/GraphDBUtils.java b/src/main/java/net/onrc/onos/util/GraphDBUtils.java
index ebc5942..097cfa0 100644
--- a/src/main/java/net/onrc/onos/util/GraphDBUtils.java
+++ b/src/main/java/net/onrc/onos/util/GraphDBUtils.java
@@ -100,6 +100,13 @@
 	}
 
 	@Override
+        public Iterable<IFlowPath> getAllFlowPaths(GraphDBConnection conn) {
+		FramedGraph<TitanGraph> fg = conn.getFramedGraph();
+		
+		return fg.getVertices("type", "flow", IFlowPath.class);
+	}
+
+	@Override
 	public IFlowEntry searchFlowEntry(GraphDBConnection conn,
 					  FlowEntryId flowEntryId) {
 		FramedGraph<TitanGraph> fg = conn.getFramedGraph();