Adding required drivers to the software upgrade pipeline

Change-Id: I6751bfeea6cc5c0ae98c14bdd823e602efe63790
diff --git a/jjb/pipeline/voltha/master/software-upgrades.groovy b/jjb/pipeline/voltha/master/software-upgrades.groovy
index 719a24f..7802907 100644
--- a/jjb/pipeline/voltha/master/software-upgrades.groovy
+++ b/jjb/pipeline/voltha/master/software-upgrades.groovy
@@ -58,6 +58,7 @@
       _TAG=voltha-port-forward kubectl port-forward --address 0.0.0.0 -n voltha svc/voltha-voltha-api 55555:55555&
       """
       sh """
+      sshpass -e ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -p 8101 karaf@127.0.0.1 cfg set org.onosproject.net.driver.impl.DriverRegistryManager requiredDrivers default,voltha
       sshpass -e ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -p 8101 karaf@127.0.0.1 log:set DEBUG org.opencord
       """
   }