CentOS 9: Disable unit tests dependent on puppet-postgresql

The puppt-postgresql module does not support CentOS 9 yet and requires
some version parameters to be run on CentOS 9. This change disables
unit tests requiring that module, until the module supports CentOS 9.

Change-Id: If26b9d1a31028bb56106a2cce0faadcc7d38757f

spec/classes/cloudkitty_db_postgresql_spec.rb

@@ -36,7 +36,10 @@ describe 'cloudkitty::db::postgresql' do
         facts.merge!(OSDefaults.get_facts({ :concat_basedir => '/var/lib/puppet/concat' }))
       end
 
-      it_behaves_like 'cloudkitty-db-postgresql'
+      # TODO(tkajinam): Remove this once puppet-postgresql supports CentOS 9
+      unless facts[:osfamily] == 'RedHat' and facts[:operatingsystemmajrelease].to_i >= 9
+        it_behaves_like 'cloudkitty-db-postgresql'
+      end
     end
   end
 end