Include deps class in unit test for mysql

Change-Id: I70ee5f7fb3efca4dd046bf442404e0f760c0b0f4

spec/classes/designate_db_mysql_spec.rb

@@ -16,6 +16,8 @@ describe 'designate::db::mysql' do
         required_params
       end
 
+      it { is_expected.to contain_class('designate::deps') }
+
       it { is_expected.to contain_openstacklib__db__mysql('designate').with(
         :user     => 'designate',
         :password => 'designatepass',