Don't pass root_helper to OVSBridge
Don't pass root_helper to OVSBridge

Change-Id: I64b39c3f5828d3a9b6430c5d01751439984dacc3
Closes-Bug: #1486935

ekosareva/networking-vsphere,ekosareva/vmware-dvs,Mirantis/vmware-dvs,openstack/networking-vsphere,ekosareva/networking-vsphere,VTabolin/networking-vsphere,VTabolin/networking-vsphere,Mirantis/vmware-dvs,stackforge/networking-vsphere,stackforge/networking-vsphere,openstack/networking-vsphere,ekosareva/vmware-dvs