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

Needed for coverage 4.0

Change-Id: Iaecda0f5380e67809158c149ef22fe5d8883ae7c

stackforge/networking-bagpipe-l2,openstack/networking-bagpipe-l2,stackforge/networking-bagpipe-l2,openstack/networking-bagpipe,openstack/networking-bagpipe-l2,openstack/networking-bagpipe