Fixes ovs bonding option
Fixes ovs bonding option

Default ovs bonding options parameter BondInterfaceOvsOptions was wrongly set to "mode=active-backup" which makes os-net-config fail. This fix changes it to "bond_mode=active-backup".

Change-Id: If3eaac6558c1a15ac09b198f90f05f1a77cf794b
Closes-Bug: #1576137

bcrochet/tripleo-heat-templates,openstack/tripleo-heat-templates,trozet/opnfv-tht,trozet/opnfv-tht,trozet/opnfv-tht,openstack/tripleo-heat-templates,bcrochet/tripleo-heat-templates,dprince/tripleo-heat-templates,bcrochet/tripleo-heat-templates,dprince/tripleo-heat-templates