Cleaning up application categories.

Change-Id: Id3c937323123b6089cedf7b31cd01151f6aca8e1
diff --git a/BUCK b/BUCK
index bb18951..c64641c 100644
--- a/BUCK
+++ b/BUCK
@@ -25,7 +25,7 @@
 
 onos_app (
     title = 'Trellis Troubleshooting Toolkit',
-    category = 'Utilities',
+    category = 'Monitoring',
     url = 'https://wiki.opencord.org/pages/viewpage.action?pageId=4456974',
     description = 'Provides static analysis of flows and groups ' +
     'to determine the possible paths a packet may take.',