It appears to be the devstack-vm-gate.sh that is installing the python3-yaml package.
https://github.com/openstack/devstack-gate/blob/master/devstack-vm-gate.sh#L281
It appears to be the devstack-vm-gate.sh that is installing the python3-yaml package.
https:/ /github. com/openstack/ devstack- gate/blob/ master/ devstack- vm-gate. sh#L281