[NET] Rename open_request to request_sock

Ok, this one just renames some stuff to have a better namespace and to
dissassociate it from TCP:

struct open_request  -> struct request_sock
tcp_openreq_alloc    -> reqsk_alloc
tcp_openreq_free     -> reqsk_free
tcp_openreq_fastfree -> __reqsk_free

With this most of the infrastructure closely resembles a struct
sock methods subset.

Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/sock.h b/include/net/sock.h
index 6919276..e593af5 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -484,7 +484,7 @@
 
 extern int sk_wait_data(struct sock *sk, long *timeo);
 
-struct or_calltable;
+struct request_sock_ops;
 
 /* Networking protocol blocks we attach to sockets.
  * socket layer -> transport layer interface
@@ -549,7 +549,7 @@
 	kmem_cache_t		*slab;
 	unsigned int		obj_size;
 
-	struct or_calltable	*rsk_prot;
+	struct request_sock_ops	*rsk_prot;
 
 	struct module		*owner;