[kolla-ansible] Upgrade roadmap

Hello guys.
I have questions:
- Can we upgrade version skipping such as Wallaby to Zed OR Wallaby >> Xena
>> Yoga >> Zed?
- Is there any way to upgrade Openstack to a new version without host
upgrade? Imaging that We have 1000 nodes as a Train version then we need to
upgrade to Zed, it is too hard,
- Is there any plan to upgrade Xena(Ubuntu 20.04) to Zed(20.04).
Thank you. Regards


Nguyen Huu Khoi