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: Id39b69578adbddcec1d661f8d79580ce28ef72a5

.zuul.yaml

@@ -3,4 +3,4 @@
       - check-requirements
       - publish-openstack-docs-pti
       - openstack-python35-jobs
-      - openstack-python3-ussuri-jobs
+      - openstack-python3-victoria-jobs

setup.cfg

@@ -18,6 +18,7 @@ classifier =
     Programming Language :: Python :: 3.5
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: Implementation :: CPython
 

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 3.1.1
-envlist = py36,py37,pypy,pep8
+envlist = py36,py38,pypy,pep8
 skipsdist = True
 ignore_basepython_conflict = True