Make onos service name configurable

Change-Id: I799ed24d461909a90fc334acfb51184d3932a42a
diff --git a/mininet/toposcripts/topo.py b/mininet/toposcripts/topo.py
index 7dd6070..8a89515 100644
--- a/mininet/toposcripts/topo.py
+++ b/mininet/toposcripts/topo.py
@@ -36,7 +36,7 @@
 
     info( '*** Creating network\n' )
     OVSSwitch13 = partial( OVSSwitch, protocols='OpenFlow13' )
-    controllerIp = socket.gethostbyname( 'onos-openflow.default.svc.cluster.local' )
+    controllerIp = socket.gethostbyname( '{{ .Values.onosOpenflowSvc }}' )
     net = Mininet( topo=SingleSwitchTopo(1),
                    controller=lambda name: RemoteController( name, ip=controllerIp, port=6653 ),
                    switch=OVSSwitch13