copr: frontend: drop useless NameVirtualHost directive
    
    From apache docs:
    Prior to 2.3.11, NameVirtualHost was required to instruct the server
    that a particular IP address and port combination was usable as a
    name-based virtual host. In 2.3.11 and later, any time an IP address and
    port combination is used in multiple virtual hosts, name-based virtual
    hosting is automatically enabled for that address.