Put a complete set of pppd(8) sample configuration files in

/usr/share/examples/pppd.

Remove the out-of-place pppd(8) configuration files in etc/ppp,
ppp.shells.sample and ppp.deny.

Make the appropriate changes to the build process, etc/Makefile and
etc/mtree/BSD.usr.mtree, so it all works.

etc/mtree/BSD.usr.dist

@@ -397,6 +397,8 @@
             ..
             ppp
             ..
+            pppd
+            ..
             printing
             ..
             scsi_target

etc/ppp/ppp.deny

@@ -1,22 +0,0 @@
-# $FreeBSD$
-#
-# list of users disallowed any pppd access via 'system
-# password login'.
-# read by pppd(8).
-root
-toor
-daemon
-operator
-bin
-tty
-kmem
-games
-news
-man
-bind
-ftp
-uucp
-xten
-pop
-ingres
-nobody

etc/ppp/ppp.shells.sample

@@ -1,14 +0,0 @@
-# $FreeBSD$
-#
-# List of acceptable shells for pppd(8).
-# Pppd will not accept a system password login
-# by a user whose shell is not listed below.
-
-/bin/sh
-/bin/csh
-/bin/tcsh
-/usr/local/bin/ksh
-/usr/local/bin/zsh
-/usr/local/bin/bash
-/usr/local/bin/tcsh
-/usr/local/bin/ppplogin.sh