Add openstack-tox-functional-py38-fips job
Add openstack-tox-functional-py38-fips job

openstack-tox-functional-py36-fips is removed in
https://review.opendev.org/c/openstack/glance/+/841350/
with the plan to be move to py38.

This commit migrate the fips job to py38.

Depends-On: https://review.opendev.org/c/openstack/openstack-zuul-jobs/+/841368
Change-Id: I0e2bca4603a34e39ffdbebaab2fcfad3a9da4241

openstack/glance,openstack/glance,openstack/glance