attr filter "attrsfile" -> "file"

[Alan DeKok]

Arran Cudbard-Bell wrote:
> It's not documented because it's not finalised. Alan D wanted to standardise on using sub section based configuration for the different sections of the server, so there's still some more work to do.
> 
> the final config for attrfilter will look something like:

  Yeah... I'm of two minds about this.  Regularizing the config is good.
 Making it more verbose is annoying.

> attrfilter {
> 	authorize {
> 		file =
> 	}
> 	preacct {
> 		file = 
> 	}
> }

  or even:

attrfilter {
	authorize.file = ...
	preacct.file = ...

}

  Which is nice, but doesn't fit the subsection paradigm.

  Alan DeKok.