Change ignore-errors to ignore_errors
Change ignore-errors to ignore_errors

Needed for coverage 4.0

Change-Id: Icbad88c71bdf49b397b3ef5a4de0c78adcae20b8

stackforge/networking-ovs-dpdk,stackforge/networking-ovs-dpdk,openstack/networking-ovs-dpdk,openstack/networking-ovs-dpdk,stackforge/networking-ovs-dpdk