The playbook fails when removing unreachable nodes from deployment with
`openstack overcloud delete node`. Some `ignore_unreachable: true` are
missing. Also, one cannot use `any_errors_fatal: true` when ignoring
unreachable nodes, otherwise the playbook execution will stop after the
current task.
Change-Id: Ibcb84e58bac1975490df281c0de950cdf74337b2
(cherry picked from commit f14007220f)