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

Needed for coverage 4.0

Change-Id: Ib63d81068db5353b1d341e22bb875839689b40ac

openstack/taskflow,pombredanne/taskflow-1,jimbobhickville/taskflow,jimbobhickville/taskflow,pombredanne/taskflow-1,openstack/taskflow