Add enable-chassis-as-gw option for OVN CMS cluster

After recent neutron change [1] we need to add option
enable-chassis-as-gw so that the chassis acts as gateway.

I am also implementing workaround for known issue on mariadb [2].

[1] https://review.opendev.org/c/openstack/neutron/+/908325
[2] https://issues.redhat.com/browse/RDO-241

Change-Id: Ie6a9a9287f64256999c05f7a3ab273c436f1cf54

packstack/puppet/modules/packstack/manifests/neutron/ovn_agent.pp

@@ -51,5 +51,6 @@ class packstack::neutron::ovn_agent ()
       bridge_interface_mappings => $bridge_uplinks,
       ovn_encap_ip              => force_ip($localip),
       hostname                  => $::fqdn,
+      ovn_cms_options           => 'enable-chassis-as-gw',
     }
 }

playbooks/packstack-centos9-pre.yaml

@@ -27,3 +27,10 @@
         chdir: '{{ ansible_user_dir }}/workspace'
       become: true
       environment: '{{ zuul }}'
+
+    # mariadb-10.11 is broken https://issues.redhat.com/browse/RDO-241
+    - name: Temporary disable mariadb module
+      shell: "sudo dnf module disable -y mariadb"
+      when: ansible_distribution == "CentOS" and ansible_distribution_major_version == "9"
+      become: true
+      changed_when: False