[NET]: move config options out to individual protocols

Move the protocol specific config options out to the specific protocols.
With this change net/Kconfig now starts to become readable and serve as a
good basis for further re-structuring.

The menu structure is left almost intact, except that indention is
fixed in most cases. Most visible are the INET changes where several
"depends on INET" are replaced with a single ifdef INET / endif pair.

Several new files were created to accomplish this change - they are
small but serve the purpose that config options are now distributed
out where they belongs.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/wanrouter/Kconfig

@@ -0,0 +1,29 @@
+#
+# Configuration for WAN router
+#
+
+config WAN_ROUTER
+	tristate "WAN router"
+	depends on EXPERIMENTAL
+	---help---
+	  Wide Area Networks (WANs), such as X.25, frame relay and leased
+	  lines, are used to interconnect Local Area Networks (LANs) over vast
+	  distances with data transfer rates significantly higher than those
+	  achievable with commonly used asynchronous modem connections.
+	  Usually, a quite expensive external device called a `WAN router' is
+	  needed to connect to a WAN.
+
+	  As an alternative, WAN routing can be built into the Linux kernel.
+	  With relatively inexpensive WAN interface cards available on the
+	  market, a perfectly usable router can be built for less than half
+	  the price of an external router.  If you have one of those cards and
+	  wish to use your Linux box as a WAN router, say Y here and also to
+	  the WAN driver for your card, below.  You will then need the
+	  wan-tools package which is available from <ftp://ftp.sangoma.com/>.
+	  Read <file:Documentation/networking/wan-router.txt> for more
+	  information.
+
+	  To compile WAN routing support as a module, choose M here: the
+	  module will be called wanrouter.
+
+	  If unsure, say N.