tipc: make struct tipc_server private for server.c

In order to narrow the interface and dependencies between the topology
server and the subscription/binding table functionality we move struct
tipc_server inside the file server.c. This requires some code
adaptations in other files, but those are mostly minor.

The most important change is that we have to move the start/stop
functions for the topology server to server.c, where they logically
belong anyway.

Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/tipc/subscr.h b/net/tipc/subscr.h
index 7209328..82ba61a 100644
--- a/net/tipc/subscr.h
+++ b/net/tipc/subscr.h
@@ -56,7 +56,7 @@ struct tipc_conn;
  */
 struct tipc_subscription {
 	struct kref kref;
-	struct tipc_server *server;
+	struct net *net;
 	struct timer_list timer;
 	struct list_head nameseq_list;
 	struct list_head sub_list;
@@ -66,7 +66,7 @@ struct tipc_subscription {
 	spinlock_t lock; /* serialize up/down and timer events */
 };
 
-struct tipc_subscription *tipc_sub_subscribe(struct tipc_server *srv,
+struct tipc_subscription *tipc_sub_subscribe(struct net *net,
 					     struct tipc_subscr *s,
 					     int conid);
 void tipc_sub_unsubscribe(struct tipc_subscription *sub);