Added debug statements for switch handshake progress and switch disconnections
diff --git a/src/main/java/net/floodlightcontroller/core/internal/OFSwitchImpl.java b/src/main/java/net/floodlightcontroller/core/internal/OFSwitchImpl.java
index 7313619..e0ff8c3 100644
--- a/src/main/java/net/floodlightcontroller/core/internal/OFSwitchImpl.java
+++ b/src/main/java/net/floodlightcontroller/core/internal/OFSwitchImpl.java
@@ -796,6 +796,8 @@
                 return head.role;
             }
             else {
+            	log.debug("Closing {} because a role request error didn't match " + 
+            			"head of pendingRoleRequests queue", this);
                 this.channel.close();
                 return null;
             }