Move tripleo::certmonger::httpd to defines folder and fix suffix

It's a define, not a class. And it also needs the _spec suffix.

Change-Id: Ie5e0cf81d03379d8b791fd77a5c78d12048ebfef

spec/defines/tripleo_certmonger_httpd_spec.rb

@@ -20,6 +20,8 @@ require 'spec_helper'
 
 describe 'tripleo::certmonger::httpd' do
 
+  let(:title) { 'httpd-cert' }
+
   shared_examples_for 'tripleo::certmonger::httpd' do
     let :params do
       {