Remove creation of voltctl config in multi stack test

The voltctl configuration file is now written in one place
(installVoltctl.groovy). No other scripts should overwrite it.

Signed-off-by: Roger Luethi <roger@opennetworking.org>
Change-Id: Id562bd04c9258543b59bcb304518c317fd372439
diff --git a/jjb/pipeline/voltha/voltha-scale-multi-stack.groovy b/jjb/pipeline/voltha/voltha-scale-multi-stack.groovy
index 8420da0..ece67a8 100644
--- a/jjb/pipeline/voltha/voltha-scale-multi-stack.groovy
+++ b/jjb/pipeline/voltha/voltha-scale-multi-stack.groovy
@@ -408,8 +408,6 @@
       timeout(time: 15, unit: 'MINUTES') {
         sh """
 
-        # we are restarting the voltha-api port-forward for each stack, no need to have a different voltconfig file
-        voltctl -s 127.0.0.1:55555 config > $HOME/.volt/config
         export VOLTCONFIG=$HOME/.volt/config
 
         # _TAG=voltha-port-forward kubectl port-forward --address 0.0.0.0 -n voltha${i} svc/voltha${i}-voltha-api 55555:55555& > /dev/null 2>&1