Add tftp setting to nodes in location management.  Basically it's not really tftp, but will use the nodes data sorces to pass information rather than trying to pull from the main server.  THis should speed up connectivity as it's working inside of it's local setup scopes.

git-svn-id: https://svn.code.sf.net/p/freeghost/code/trunk@1842 71f96598-fa45-0410-b640-bcd6f8691b32