install configuration files

* introduce a variable that points to the target directory
* update tasks to use the variable
* create necessary directories
* copy necessary files
* install buildbot.net zone
* update configuration templates to use the variable
* install configuration files using the templates
* add handler to reload configuration upon change
* enable and start named service
move traditional root hinting and rfc related zones to a separate file

* this makes the main config file a bit more manageable
update named.conf.options