webif: Add a GUI for configuring VLAN interfaces

This patch adds a new CGI file which allows users to edit the
VLAN configuration as well as configuring zones as bridges.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

config/menu/30-network.menu

@@ -3,6 +3,11 @@
 			        'title' => "$Lang::tr{'net config'}",
 			        'enabled' => 0,
 			        };
+	$subnetwork->{'11.zoneconf'} = {'caption' => "$Lang::tr{'zoneconf title'}",
+			        'uri' => '/cgi-bin/zoneconf.cgi',
+			        'title' => "$Lang::tr{'zoneconf title'}",
+			        'enabled' => 1,
+			        };
     $subnetwork->{'20.proxy'} = {'caption' => "$Lang::tr{'web proxy'}",
 			        'uri' => '/cgi-bin/proxy.cgi',
 			        'title' => "$Lang::tr{'web proxy'}",