Switch testing to Victoria testing runtime

Upating the testing template from ussuri to victoria
testing runtime
- https://governance.openstack.org/tc/reference/runtimes/victoria.html

Change-Id: If4a110080febc17420842740607a5e0f84cd215f

.zuul.yaml

@@ -9,7 +9,7 @@
       - nodejs8-jobs
       - publish-openstack-docs-pti
       - openstack-python35-jobs
-      - openstack-python3-ussuri-jobs
+      - openstack-python3-victoria-jobs
     check:
       jobs:
       - tempest-full-py3:

setup.cfg

@@ -20,6 +20,7 @@ classifier =
     Programming Language :: Python :: 3.5
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
 
 [files]
 packages =

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 
 minversion = 3.1.1
-envlist = py36,py37,pypy,pep8
+envlist = py36,py38,pypy,pep8
 skipsdist = True
 ignore_basepython_conflict = True