We are working now on porting ovirt-imageio to python 3. One nasty issue is having to 

ovirt-imageio-proxy, running on engine host on CentOS/RHEL >= 7.7 - with python 2.7.

Supporting both python 2.7 and 3 is major pain (complicated build, new packages names)

and we like to avoid this. 

We can switch to python 3 only, if we use the new python 3.6 package added in 7.7.

Maybe we can do the same for otopi/engine-setup?

Do you see any issue with this?

Nir