Use default neutron backend in the base grenade job

When devstack was switching to ML2/OVN as default backend,
in the base grenade job it was explicitly configured to use old default
ML2/OVS backend. It was done like that to avoid problems with upgrade
and change backend in the same job.
Now, as ML2/OVN is default backend in Devstack since at least
couple of cycles it's fine to switch grenade jobs to use default
backend.

Depends-On: https://review.opendev.org/c/openstack/ironic/+/866993
Depends-On: https://review.opendev.org/c/openstack/devstack/+/867065

Change-Id: Iede9fe71d81fc86a92122800d5a16f45442dd79e

.zuul.yaml

@@ -40,6 +40,7 @@
       - zuul: opendev.org/openstack/openstack-zuul-jobs
       - zuul: opendev.org/openstack/devstack
       - zuul: opendev.org/openstack/tempest
+      - zuul: opendev.org/openstack/neutron-tempest-plugin
     vars:
       devstack_bases:
         shared: /opt/stack
@@ -78,13 +79,6 @@
           ERROR_ON_CLONE: true
           # Gate jobs can't deal with nested virt. Disable it.
           LIBVIRT_TYPE: qemu
-          # TODO(jlibosva): Devstack defaults to OVN but OVN Grenade
-          #                 as of early Victoria does not work. We can
-          #                 remove setting explicitly ML2/OVS mech
-          #                 driver for Grenade once OVN works with Grenade.
-          Q_AGENT: openvswitch
-          Q_ML2_TENANT_NETWORK_TYPE: vxlan
-          Q_ML2_PLUGIN_MECHANISM_DRIVERS: openvswitch
           # TODO(slaweq): It can be removed when devstack patch
           # https://review.opendev.org/c/openstack/devstack/+/849145 will be
           # merged in master and last stable branch
@@ -234,25 +228,18 @@
         # Neutron services
         # We need to keep using the neutron-legacy based services for
         # now until all issues with the new lib/neutron code are solved
-        # TODO(jlibosva): Devstack defaults to OVN but OVN Grenade
-        #                 as of early Victoria does not work. We can
-        #                 remove setting explicitly ML2/OVS mech
-        #                 driver for Grenade once OVN works with Grenade.
-        q-agt: true
-        q-dhcp: true
-        q-l3: true
-        q-meta: true
-        q-metering: true
         q-svc: true
-        ovn-controller: false
-        ovn-northd: false
-        q-ovn-metadata-agent: false
-        # neutron-api: true
-        # neutron-agent: true
-        # neutron-dhcp: true
-        # neutron-l3: true
-        # neutron-metadata-agent: true
-        # neutron-metering: true
+        q-agt: false
+        q-dhcp: false
+        q-l3: false
+        q-meta: false
+        q-metering: false
+        q-dns: true
+        q-ovn-metadata-agent: true
+        ovn-controller: true
+        ovn-northd: true
+        ovs-vswitchd: true
+        ovsdb-server: true
         neutron-trunk: true
         # Swift services
         s-account: true
@@ -290,8 +277,18 @@
           # Neutron services
           # We need to keep using the neutron-legacy based services for
           # now until all issues with the new lib/neutron code are solved
-          q-agt: true
-          # neutron-agent: true
+          ovn-controller: true
+          ovn-northd: false
+          ovs-vswitchd: true
+          ovsdb-server: true
+          q-fake: true
+          q-svc: false
+          q-agt: false
+          q-dhcp: false
+          q-l3: false
+          q-meta: false
+          q-metering: false
+          q-ovn-metadata-agent: true
           # Cinder services
           c-bak: true
           c-vol: true
@@ -373,6 +370,7 @@
       Basic multinode grenade job
     parent: grenade
     nodeset: openstack-two-node-focal
+    pre-run: playbooks/multinode-pre.yaml
 
 - job:
     name: grenade-skip-level

playbooks/multinode-pre.yaml

@@ -0,0 +1,4 @@
+- hosts: all
+  roles:
+    - multi-node-bridge
+    - multi-node-setup