Revert "sit: stateless autoconf for isatap"

This reverts commit 645069299a1c7358cf7330afe293f07552f11a5d.

While the code does not actually break anything, it does not completely follow
RFC5214 yet. After talking back with Fred L. Templin, I agree that completing the
ISATAP specific RS/RA code, would pollute the kernel a lot with code that is better
implemented in userspace.

The kernel should not send RS packages for ISATAP at all.

Signed-off-by: Sascha Hlusiak <contact@saschahlusiak.de>
Acked-by: Fred L. Templin <Fred.L.Templin@boeing.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/if_tunnel.h b/include/linux/if_tunnel.h
index 5eb9b0f..5a9aae4 100644
--- a/include/linux/if_tunnel.h
+++ b/include/linux/if_tunnel.h
@@ -44,7 +44,7 @@
 	__u16			flags;
 	__u16			__reserved;
 	__u32			datalen;
-	__u32			rs_delay;
+	__u32			__reserved2;
 	/* data follows */
 };