master.passwd.5 and various passwd.5 changes (diff)

[Sascha Wildner]

Jeremy C. Reed wrote:
This adds master.passwd.5 file (same file as passwd.5).

And this changes FreeBSD (as appropriate to DragonFly).

Removes old documentation about older (FreeBSD) versions of YP.
(Maybe I should keep part of this, and reword?)
May I commit any of this?
Looks good to me. One minor nit, though. Instead of

. Dx Ns 's

use the .Ap macro (see mdoc(7)). Like this:

. Dx Ap s

Thanks.

Sascha