[ONOS-6860] Tetunnel missing dependency in BUCK (Tetopology)

Change-Id: I8fa4381792e4d3f6ea6bc321375adcdacd1dd890
diff --git a/apps/tetunnel/BUCK b/apps/tetunnel/BUCK
index 3ef3e65..1f6af77 100644
--- a/apps/tetunnel/BUCK
+++ b/apps/tetunnel/BUCK
@@ -10,5 +10,5 @@
     url = 'http://onosproject.org',
     description = 'Application to create and manage TE tunnels.',
     included_bundles = BUNDLES,
+    required_apps = [ 'org.onosproject.tetopology' ],
 )
-