Include deps class in unit test for postgresql

Change-Id: I11fed9bf793abf7da6876b375b478e69a71be53c

spec/classes/octavia_db_postgresql_spec.rb

@@ -16,6 +16,8 @@ describe 'octavia::db::postgresql' do
         req_params
       end
 
+      it { is_expected.to contain_class('octavia::deps') }
+
       it { is_expected.to contain_openstacklib__db__postgresql('octavia').with(
         :user       => 'octavia',
         :password   => 'octaviapass',