[infra][kolla] Kayobe CI failing on vexxhost

Hi, Some of the Kayobe CI jobs are failing when run on the vexxhost cloud. The particular part that fails is when testing 'bare metal' deployment using libvirt/qemu VMs. As far as I can tell, the test passes fairly reliably on other clouds, and fails reliably on vexxhost. Does anyone have any suggestion as to what might be causing this? priteau suggested entropy could be an issue, but we have not investigated yet. Is there any way to block a particular cloud provider for certain CI jobs until this is resolved? Thanks, Mark