Overhaul dhcpcd for chrome os use

dhcpcd-hooks/50-yp.conf

Index: dhcpcd-hooks/50-yp.conf
diff --git a/dhcpcd-hooks/50-yp.conf b/dhcpcd-hooks/50-yp.conf
deleted file mode 100644
index 4bdd0623e7f465cf238cf1cdb49096fc94619a91..0000000000000000000000000000000000000000
--- a/dhcpcd-hooks/50-yp.conf
+++ /dev/null
@@ -1,50 +0,0 @@
-# Sample dhcpcd hook for ypbind
-# This script is only suitable for the Linux version.
-
-ypbind_pid()
-{
-	[ -s /var/run/ypbind.pid ] && cat /var/run/ypbind.pid
-}
-
-make_yp_conf()
-{
-	[ -z "$new_nis_domain" -a -z "$new_nis_servers" ] && return 0
-	local cf=/etc/yp.conf."$interface" prefix= x= pid=
-	rm -f "$cf"
-	echo "$signature" > "$cf"
-	if [ -n "$new_nis_domain" ]; then
-		domainname "$new_nis_domain"
-		if [ -n "$new_nis_servers" ]; then
-			prefix="domain $new_nis_domain server "
-		else
-			echo "domain $new_nis_domain broadcast" >> "$cf"
-		fi
-	else
-		prefix="ypserver "
-	fi
-	for x in $new_nis_servers; do
-		echo "$prefix$x" >> "$cf"
-	done
-	save_conf /etc/yp.conf
-	cat "$cf" > /etc/yp.conf
-	rm -f "$cf"
-	pid="$(ypbind_pid)"
-	if [ -n "$pid" ]; then
-		kill -HUP "$pid"
-	fi
-}
-
-restore_yp_conf()
-{
-	[ -n "$old_nis_domain" ] && domainname ""
-	restore_conf /etc/yp.conf || return 0
-	local pid="$(ypbind_pid)"
-	if [ -n "$pid" ]; then
-		kill -HUP "$pid"
-	fi
-}
-
-case "$reason" in
-BOUND|INFORM|REBIND|REBOOT|RENEW|TIMEOUT|STATIC)	make_yp_conf;;
-EXPIRE|FAIL|IPV4LL|NAK|NOCARRIER|RELEASE|STOP)		restore_yp_conf;;
-esac