
This is a follow-up change to [1]. Depending on operating system and environment configuration, default libvirt network may not exist. Right now, `Check for libvirt default network` task throws an error in this case causing nova playbook to fail. This change fixes that by instructing ansible to not throw an error if `virsh net-list` fails with "Network not found: no network with matching name" because it is acceptable to not have this network. [1] https://review.opendev.org/c/openstack/openstack-ansible-os_nova/+/899768 Change-Id: If692bc94f421bc84ad9e6d43f548b68196a9e751