Requiring voltha driver to be present before the driverService can be active

Change-Id: I3f7f83bb3a254bbc19dd69c733fe94d09f58337d
diff --git a/Jenkinsfile-voltha-build b/Jenkinsfile-voltha-build
index 875cce7..4a665ef 100644
--- a/Jenkinsfile-voltha-build
+++ b/Jenkinsfile-voltha-build
@@ -260,6 +260,7 @@
                             sshpass -p karaf ssh -q -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -p 30115 karaf@${deployment_config.nodes[0].ip} "cfg set org.onosproject.provider.lldp.impl.LldpLinkProvider enabled false"
                             sshpass -p karaf ssh -q -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -p 30115 karaf@${deployment_config.nodes[0].ip} "cfg set org.onosproject.net.flow.impl.FlowRuleManager purgeOnDisconnection false"
                             sshpass -p karaf ssh -q -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -p 30115 karaf@${deployment_config.nodes[0].ip} "cfg set org.onosproject.net.meter.impl.MeterManager purgeOnDisconnection false"
+                            sshpass -p karaf ssh -q -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -p 30115 karaf@${deployment_config.nodes[0].ip} "cfg set org.onosproject.net.driver.impl.DriverRegistryManager requiredDrivers default,voltha"
                             """
                             return sr_active_out == 0
                         }