Add zend opcache template to enable it

Add zend opcache template to enable it. This template is based on the opcache.ini in the php54-php-pecl-zendopcache-7.0.2-4.el6.x86_64.
I think we should keep using APC for PHP 5.3. So I won't include opcache.ini for 5.3 and it will not be enabled OPCache on 5.3.