Make fasttoggle_config return the new style struct

Make fasttoggle_config functions return the additional items that
were formerly added as we checked access. This means the higher
level that does the permissions checking now simply unsets the
elements the user doesn't have permission to use, rather than
building a new array as it goes.

Signed-off-by: Nigel Cunningham <nigel@nigelcunningham.com.au>