udhcpc: fix resolv.conf setting for domain

The value that was supposed to be in the domain setting was being added
incorrectly to search.

Reported-by: bug@mejor.pl
X-Gentoo-Bug: 446862
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=446862

sh/udhcpc-hook.sh.in

@@ -14,7 +14,7 @@ update_dns()
 	[ -z "${domain}" ] && [ -z "${dns}" ] && return
 
 	conf="# Generated by udhcpc for ${interface}\n"
-	[ -n "${domain}" ] && conf="${conf}search ${domain}\n"
+	[ -n "${domain}" ] && conf="${conf}domain ${domain}\n"
 	for i in ${dns} ; do
 		conf="${conf}nameserver ${i}\n"
 	done