Drop python3.6/3.7 support in testing runtime

In Zed cycle testing runtime, we are targetting to drop the
python 3.6/3.7 support, project started adding python 3.8 as minimum,

example nova:
- https://github.com/openstack/nova/blob/56b5aed08c6a3ed81b78dc216f0165ebfe3c3350/setup.cfg#L13

Also moving zuul jobs to Zed.
Also indicate that we support py3.9

Change-Id: Ifb6188b4e623d40bcadb3c92462024f80616291d

move victoria's zuul jobs to zed

Change-Id: I0200db8add157d28a0bc0859ea126b2e4711f75e