Let an inactive switch remove the links from the network map. The link update code will add it back.
This is the fix the case where some inactive switches still have links.

Decrease the logging from AddOrUpdateLink().
diff --git a/src/main/java/net/floodlightcontroller/linkdiscovery/internal/LinkStorageImpl.java b/src/main/java/net/floodlightcontroller/linkdiscovery/internal/LinkStorageImpl.java
index 83abc8e..176a1a0 100644
--- a/src/main/java/net/floodlightcontroller/linkdiscovery/internal/LinkStorageImpl.java
+++ b/src/main/java/net/floodlightcontroller/linkdiscovery/internal/LinkStorageImpl.java
@@ -72,7 +72,7 @@
 	public void addOrUpdateLink(Link lt, LinkInfo linkinfo, DM_OPERATION op) {
 		Vertex vportSrc = null, vportDst = null;
 	
-		log.debug("addOrUpdateLink(): op {} {} {}", new Object[]{op, lt, linkinfo});
+		log.trace("addOrUpdateLink(): op {} {} {}", new Object[]{op, lt, linkinfo});
 		
         try {
             // get source port vertex