Cleaning up app categories.

Change-Id: I30806c81bf9e8db87f31509d9a346960f79ef207
diff --git a/apps/dhcprelay/BUCK b/apps/dhcprelay/BUCK
index 6f28dea..2510a98 100644
--- a/apps/dhcprelay/BUCK
+++ b/apps/dhcprelay/BUCK
@@ -10,7 +10,7 @@
 onos_app (
     app_name = 'org.onosproject.dhcprelay',
     title = 'DHCP Relay Agent App',
-    category = 'default',
+    category = 'Utility',
     url = 'http://onosproject.org',
     description = 'DHCP Relay Agent Application.',
 )