do not fail script if  fails
do not fail script if  fails

The cleanup script will examine failed stacks and
remove the associated networks and ports.  We should
not fail the script if the stack delete command fails.

Change-Id: I5d6e669e10a24cd7b85a075b0e154cba375fdd89

redhat-openstack/rdo-infra,rdo-infra/ci-config,rdo-infra/ci-config,rdo-infra/ci-config,rdo-infra/ci-config,redhat-openstack/rdo-infra,redhat-openstack/rdo-infra,redhat-openstack/rdo-infra