Use OVS backend for testing os-ken library

Only OVS agent uses os-ken library, makes sense that the CI job
testing it uses this backend.

Closes-Bug: #1933626
Change-Id: I8b2eb11dfae5bc67ee9c3629f609e4b461e0ad7c

zuul.d/project.yaml

@@ -92,7 +92,7 @@
         - neutron-fullstack
         - neutron-ovn-tempest-postgres-full
         - neutron-ovn-tempest-mariadb-full
-        - neutron-ovn-tempest-with-os-ken-master
+        - neutron-ovs-tempest-with-os-ken-master
         - neutron-ovn-tempest-ovs-master-fedora
         - neutron-ovn-tempest-with-neutron-lib-master
         - devstack-tobiko-faults-centos:

zuul.d/tempest-singlenode.yaml

@@ -247,8 +247,8 @@
     irrelevant-files: *tempest-db-irrelevant-files
 
 - job:
-    name: neutron-ovn-tempest-with-os-ken-master
-    parent: tempest-integrated-networking
+    name: neutron-ovs-tempest-with-os-ken-master
+    parent: neutron-ovs-tempest-base
     timeout: 10800
     required-projects:
       - openstack/neutron