Add /etc/autofs/include_nis, a non-rewriting NIS map.

Submitted by:	G. Paul Ziemba
Suggested by:	asomers@
MFC after:	2 weeks
Sponsored by:	DARPA, AFRL

etc/autofs/Makefile

@@ -1,6 +1,7 @@
 # $FreeBSD$
 
 FILES=		include_ldap \
+		include_nis \
 		include_nis_nullfs \
 		special_hosts \
 		special_media \

etc/autofs/include_nis

@@ -0,0 +1,14 @@
+#!/bin/sh
+#
+# $FreeBSD$
+#
+
+if [ -n "$2" ]; then
+	ypmatch $2 $1
+	exit 0
+fi
+
+if [ -n "$1" ]; then
+	ypcat -k $1
+	exit 0
+fi