Some VMs are created before the ovn mgiration process starts in order to
verify they are healthy after the migration
Sometimes these VMs are not accessible via ssh due to an issue in cirros
0.4.0 that was fixed in a later release [1]
Closes-Bug: #1945299
[1] https://github.com/cirros-dev/cirros/pull/11
Change-Id: Ib133b5e1bed19aeac8514e3c6690ca768991bbd4