Remove the mastefile-format map option

As previously announced, this commit removes the masterfile-format
format 'map' from named, all the tools, the documentation and the
system tests.

bin/tests/system/masterformat/ns3/named.conf.in

@@ -31,13 +31,13 @@ controls {
 
 zone "example" {
 	type primary;
-	masterfile-format map;
-	file "example.db.map";
+	masterfile-format raw;
+	file "example.db.raw";
 };
 
 zone "dynamic" {
 	type primary;
-	masterfile-format map;
-	file "dynamic.db.map";
+	masterfile-format raw;
+	file "dynamic.db.raw";
 	allow-update { any; };
 };