Add "location" keyword to specify path-specific configuration in

servers, for example auto index for a sub-directory only.  Internally,
a "location" is just a special type of a "virtual" server.

src/etc/examples/httpd.conf

@@ -1,4 +1,4 @@
-# $OpenBSD: httpd.conf,v 1.3 2014/07/29 16:17:28 reyk Exp $
+# $OpenBSD: httpd.conf,v 1.4 2014/07/30 10:05:14 reyk Exp $
 
 # Macros
 ext_addr="egress"
@@ -9,6 +9,9 @@ ext_addr="egress"
 # Servers
 server "default" {
 	listen on $ext_addr port 80
+	location "/pub/*" {
+		directory auto index
+	}
 }
 
 # A name-based "virtual" server on the same address