ZF-10267: Add support for reg-names


Zend_Validate_Hostname should add support for reg-names. See for detials.

This is basically a name composed of most unreserved characters, incl. underscores, tildas etc. You can also use the same type of host names in /etc/hosts for example. It's way more permissive than DNS.

This detection should be off per default


Implemented with r22830