[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/linux/tcp.h b/include/linux/tcp.h
index 86771b3..fb54292 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -236,7 +236,7 @@
 	__u32			 snt_isn;
 };
 
-static inline struct tcp_request_sock *tcp_rsk(const struct open_request *req)
+static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req)
 {
 	return (struct tcp_request_sock *)req;
 }
@@ -393,8 +393,8 @@
 	struct tcp_listen_opt	*listen_opt;
 
 	/* FIFO of established children */
-	struct open_request	*accept_queue;
-	struct open_request	*accept_queue_tail;
+	struct request_sock	*accept_queue;
+	struct request_sock	*accept_queue_tail;
 
 	unsigned int		keepalive_time;	  /* time before keep alive takes place */
 	unsigned int		keepalive_intvl;  /* time interval between keep alive probes */