Change GUI and GUI2 to be apps rather than core features

Change-Id: I862e5bdbccc29fd78716159e168e7a14bc5053e1
diff --git a/tools/test/cells/simon-uk b/tools/test/cells/simon-uk
index 703be03..6fae098 100644
--- a/tools/test/cells/simon-uk
+++ b/tools/test/cells/simon-uk
@@ -39,7 +39,7 @@
 export ONOS_USER=sdn
 
 ## the apps we want activated at startup
-export ONOS_APPS="drivers,openflow,proxyarp,drivermatrix,mlb"
+export ONOS_APPS="gui,drivers,openflow,proxyarp,drivermatrix,mlb"
 
 ## mininet VM
 export OCN="192.168.56.99"