tipc: Eliminate obsolete native API forwarding routines

Moves the content of each native API message forwarding routine
into the sole routine that calls it, since the forwarding routines
no longer be called in isolation. Also removes code in each routine
that altered the outgoing message's importance level since this is
now no longer possible.

The previous function mapping (parent function, and child API) was
as follows:

   tipc_send2name
       \--tipc_forward2name

   tipc_send2port
       \--tipc_forward2port

   tipc_send_buf2port
       \--tipc_forward_buf2port

After this commit, the children don't exist and their functionality
is completely in the respective parent.

Signed-off-by: Allan Stephens <Allan.Stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tipc/port.h

@@ -222,8 +222,6 @@ int tipc_disconnect_port(struct tipc_port *tp_ptr);
 /*
  * TIPC messaging routines
  */
-#define TIPC_PORT_IMPORTANCE 100	/* send using current port setting */
-
 int tipc_send(u32 portref, unsigned int num_sect, struct iovec const *msg_sect);
 
 int tipc_send2name(u32 portref, struct tipc_name const *name, u32 domain,