Undefine ssl certificate parameters for mariadb

After mariadb 10.5.18, mariadb fails to start if ssl cert parameters
are configured in the file but the certificates do not exist [1]. This
problem was fixed in puppetlabs-mysql 13.1.0[2] but we use older
versions (13.0.0 in stable/zed for example) in stable branch jobs.

CentOS Stream 9 has just bumped to mariadb-10.5.22 and this is breaking
all non-ssl jobs.

All releases <= Zed didn't use ssl in mariadb with p-o-i deployments
but puppetlabs-mysql set default values so we need to explicitly
undefine them.

[1] https://mariadb.com/kb/en/mariadb-10-5-18-release-notes/#ssl
[2] https://github.com/puppetlabs/puppetlabs-mysql/issues/1509

Change-Id: Ibe0a00c02dcf855b313ea2e31f098e3d46d2c088

manifests/mysql.pp

@@ -1,5 +1,13 @@
 class openstack_integration::mysql {
 
-  class { 'mysql::server': }
+  class { 'mysql::server':
+    override_options => {
+      'mysqld' => {
+        'ssl-ca'   => undef,
+        'ssl-cert' => undef,
+        'ssl-key'  => undef,
+      },
+    },
+  }
 
 }