Clean up variables

Moved a few variables to core
Re-arranged variables to more consistent grouping
Few more variables consolidated

moved cobbler variables into core.pp
Comment out sshroot

Most won't want/need that module.
Moved top level variables back to site.pp

being embedded in node was causing some concerns.  returning
the variables to the site.pp.  Placed them in the "doesn't
change often" section
Merge branch 'all-in-one' into multi-node
Add an all-in-one example site.pp.

A simplified all-in-one example site.pp.