Move all conf file stuff to talloc
Make modules use talloc
Use talloc for clients.c
Clean up modules, etc. before freeing mainconfig
Move virtual servers to talloc
Talloc REQUESTs
Convert rad_alloc and rad_free to use talloc
Require that the modules call talloc for their instance handle.

The server builds, but it WILL have talloc/malloc conflicts, as
the modules have not been updated.

The assumption here is that the modules return an instance handle,
EVEN IF they haev an error.  The server core will now take care
of calling the appropriate detach() method.
Shouldn't be any config when we boot
Use destructor
Re-add TGT_PREREQS for libfreeradius-radius