Added a nsock log message to nsock_connect_internal.

Explicitely indicates that a connection is about to be
redirected through the proxy chain.

nsock/src/nsock_connect.c

@@ -166,6 +166,9 @@ void nsock_connect_internal(mspool *ms, msevent *nse, int type, int proto, struc
       && (nse->handler != nsock_proxy_ev_dispatch)) {   /* for reentrancy */
     struct proxy_node *current;
 
+    nsock_log_debug_all(ms, "TCP connection request (EID %d) redirected through proxy chain",
+                        nse->id);
+
     current = proxy_ctx_node_current(iod->px_ctx);
     assert(current != NULL);