Make ovs job single-node and re-enable vrrp test

For testing  purposes

Change-Id: I71a8f2213364b3ad1114ba980ae1a8ff3b8eeca1

zuul.d/master_jobs.yaml

@@ -399,10 +399,9 @@
 - job:
     name: whitebox-neutron-tempest-plugin-openvswitch
     parent: whitebox-neutron-tempest-plugin-base-nested-switch
-    pre-run:
-      - playbooks/preparations.yaml
-      - playbooks/multinode-devstack-ovs-tempest.yaml
-    timeout: 10000
+    pre-run: playbooks/preparations.yaml
+    nodeset: whitebox-neutron-single-node-centos-9-stream
+    timeout: 10800
     vars:
       configure_swap_size: 2048
       devstack_services:
@@ -438,9 +437,6 @@
         - qos-bw-minimum-ingress
       network_available_features: &available_features
         - ipv6_metadata
-      # test_vrrp is unstable on multinode ovs devstack, uncomment when/if fixed
-      tempest_exclude_regex: "\
-          (^whitebox_neutron_tempest_plugin.tests.scenario.test_vrrp)"
       devstack_localrc:
         Q_AGENT: openvswitch
         Q_ML2_TENANT_NETWORK_TYPE: vxlan