General link discovery module cleanup.

* Removed all events we don't use from the event system (switch and port
  events, link updates)
* Refactored event interface to two separate methods to match the other event
  interfaces
* Removed the LDUpdate class and moved all the event enums and classes to be
  internal to the LinkDiscoveryManager
* Removed all LinkTypes we no longer used and moved the one remaining type
  to the ILinkDiscoveryService. After this the ILinkDiscovery interface is
  no longer needed.
* Made Link immutable
* Removed the linkdiscovery.internal package as it only contained one class
* Readability improvements to LinkDiscoveryManager

Change-Id: Ifae97879aadc49b70a7b3d2294dcc540538c2cfc
diff --git a/src/main/java/net/onrc/onos/core/linkdiscovery/web/LinkWithType.java b/src/main/java/net/onrc/onos/core/linkdiscovery/web/LinkWithType.java
index 234ff98..01a1539 100644
--- a/src/main/java/net/onrc/onos/core/linkdiscovery/web/LinkWithType.java
+++ b/src/main/java/net/onrc/onos/core/linkdiscovery/web/LinkWithType.java
@@ -2,7 +2,7 @@
 
 import java.io.IOException;
 
-import net.onrc.onos.core.linkdiscovery.ILinkDiscovery.LinkType;
+import net.onrc.onos.core.linkdiscovery.ILinkDiscoveryService.LinkType;
 import net.onrc.onos.core.linkdiscovery.Link;
 
 import org.codehaus.jackson.JsonGenerator;