Add sample rules for amd.host, mostly from the AMD docs, but tweaked to fit

the FreeBSD Makefile.yp structure by me.  This allows you to have a single
amd map for all machines in a cluster.

In /etc/sysconfig, it would look something like:
  amdflags="-p -a /net -c 1800 -l syslog /host amd.host"

usr.sbin/ypserv/Makefile.yp

@@ -1,7 +1,7 @@
 #
 # Makefile for the NIS databases
 #
-# $Id: Makefile.yp,v 1.7 1996/06/25 20:28:01 wpaul Exp $
+# $Id: Makefile.yp,v 1.8 1996/07/18 23:48:13 adam Exp $
 #
 # This Makefile should only be run on the NIS master server of a domain.
 # All updated maps will be pushed to all NIS slave servers listed in the
@@ -102,6 +102,7 @@ MASTER	  = $(MASTER_PASSWD)
 YPSERVERS = $(YPDIR)/ypservers	# List of all NIS servers for a domain
 PUBLICKEY = $(YPSRCDIR)/publickey
 NETID     = $(YPSRCDIR)/netid
+AMDHOST   = $(YPSRCDIR)/amd.host
 
 target: 
 	@$(RM) $(NFILE)
@@ -117,7 +118,8 @@ target:
 #
 
 all:  master.passwd passwd hosts group networks protocols rpc \
-      services servers netid # aliases publickey netgrp ethers bootparam
+      services servers netid # aliases publickey netgrp ethers bootparam \
+      amd.host
 
 ethers:	   ethers.byname ethers.byaddr
 bootparam: bootparams
@@ -485,3 +487,25 @@ master.passwd.byuid: $(MASTER)
 	@$(DBLOAD) -c
 	@if [ ! $(NOPUSH) ]; then $(YPPUSH) -d $(DOMAIN) $@; fi
 	@if [ ! $(NOPUSH) ]; then echo "Pushed $@ map." ; fi
+
+amd.host: $(AMDHOST)
+	@echo "Updating $@..."
+	@echo $@.$$$$ > $(NFILE)
+	$(CAT) $(AMDHOST) | \
+	$(AWK) '$$1 !~ "#"  { \
+	  for (i = 1; i <= NF; i++) \
+	  if (i == NF) { \
+	    if (substr($$i, length($$i), 1) == "\\") \
+	      printf("%s", substr($$i, 1, length($$i) - 1)); \
+	    else \
+	      printf("%s\n", $$i); \
+	  } \
+	  else \
+	    printf("%s ", $$i); \
+	}' | \
+	$(DBLOAD) -i $(AMDHOST) -o $(YPMAPDIR)/$@ - $(TMP)
+	@$(MV) $(TMP) $@
+	@$(DBLOAD) -c
+	@if [ ! $(NOPUSH) ]; then $(YPPUSH) -d $(DOMAIN) $@; fi
+	@if [ ! $(NOPUSH) ]; then echo "Pushed $@ map." ; fi
+