Fix named_directory usage

similar to e573baf
was broken by 019e1e4

Author: bmwiedemann

bind/files/arch/named.conf

@@ -1,7 +1,7 @@
 // vim:set ts=4 sw=4 et:
 
 options {
-    directory "{{ named_directory }}";
+    directory "{{ map.get('named_directory') }}";
     pid-file "/run/named/named.pid";
 
     // Uncomment these to enable IPv6 connections support

bind/files/freebsd/named.conf

@@ -11,7 +11,7 @@
 options {
 	// All file and path names are relative to the chroot directory,
 	// if any, and should be fully qualified.
-	directory	"{{ named_directory }}";
+	directory	"{{ map.get('named_directory') }}";
 	pid-file	"/var/run/named/pid";
 	dump-file	"/var/dump/named_dump.db";
 	statistics-file	"/var/stats/named.stats";

bind/files/suse/named.conf

@@ -18,7 +18,7 @@ options {
 
 	# The directory statement defines the name server's working directory
 
-	directory "{{ named_directory }}";
+	directory "{{ map.get('named_directory') }}";
 
 	# enable DNSSEC validation
 	#