Network Graph Refactoring: Northbound API cleanup
 * Renamed/shortened methods:
   Link.getSourcePort() -> getSrcPort()
   Link.getDestinationPort() -> getDstPort()
   Link.getSourceSwitch() -> getSrcSwitch()
   Link.getDestinationSwitch() -> getDstSwitch()

 * Added Javadoc comments

 * Removed deprecated and unused methods:
   Link.getSourceSwitchDpid()
   Link.getSorcePortNumber()
   Link.getDestinationSwitchDpid()
   Link.getDestinationPortNumber()
   NetworkGraph.getOutgoingLinksFromSwitch()
   NetworkGraph.getIncomingLinksFromSwitch()

 * Moved method LinkEvent.getLink(NetworkGraph graph)
   to NetworkGraph.getLink()

Change-Id: Ibedba53fc6cd04d77f508ee67d41b2cfa515d3fc
diff --git a/src/main/java/net/onrc/onos/ofcontroller/networkgraph/serializers/LinkSerializer.java b/src/main/java/net/onrc/onos/ofcontroller/networkgraph/serializers/LinkSerializer.java
index bb13c75..57bcbe8 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/networkgraph/serializers/LinkSerializer.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/networkgraph/serializers/LinkSerializer.java
@@ -22,13 +22,13 @@
 			throws IOException, JsonGenerationException {
 		jsonGenerator.writeStartObject();
 		jsonGenerator.writeStringField("src-switch", 
-				HexString.toHexString(link.getSourceSwitch().getDpid()));
+				HexString.toHexString(link.getSrcSwitch().getDpid()));
 		jsonGenerator.writeNumberField("src-port", 
-				link.getSourcePort().getNumber());
+				link.getSrcPort().getNumber());
 		jsonGenerator.writeStringField("dst-switch", 
-				HexString.toHexString(link.getDestinationSwitch().getDpid()));
+				HexString.toHexString(link.getDstSwitch().getDpid()));
 		jsonGenerator.writeNumberField("dst-port", 
-				link.getDestinationPort().getNumber());
+				link.getDstPort().getNumber());
 		jsonGenerator.writeEndObject();
 	}