Removed unnecesary and misleadin method new from EBox::ThirdParty::Apach...

...e2::AuthCookie subclasess

Is misleading because it tricks you in believing that you are dealing with instances when they are all class methods. (lost time yesterday because that)

 Moreover it would be positive change all the $self to $class in this packages but I don't have time to test such a change.

Very low priority