Use ebtables-legacy also in ovn multinode jobs

For other jobs which inherits from neutron-tempest-base it
was changed some time ago.
But ovn multinode jobs don't inherits from that base job
so this patch fixes it for those jobs as well by adding same
configure_ebtables.yaml playbook to pre-run in the
neutron-ovn-multinode-base job.

Change-Id: Icb4fd80133ee10ad6c40e160013b4ab91d2c5a6b
Closes-Bug: #1898211

playbooks/prepare-ovn-multinode.yaml

@@ -0,0 +1,7 @@
+- hosts: all
+  roles:
+    # TODO(slaweq): remove it when nftables will support syntax for src and
+    # destination IP addresses in arp tables:
+    - legacy_ebtables
+    - multi-node-bridge
+    - multi-node-setup

zuul.d/tempest-multinode.yaml

@@ -116,7 +116,7 @@
     roles:
       - zuul: zuul/zuul-jobs
       - zuul: openstack/neutron-tempest-plugin
-    pre-run: playbooks/multinode-setup.yaml
+    pre-run: playbooks/prepare-ovn-multinode.yaml
     vars:
       devstack_local_conf:
         test-config: