change default of rate_limit_utp to true

ChangeLog

@@ -1,4 +1,5 @@
 
+	* change default of rate_limit_utp to true
 	* fixed DLL export issue on windows (when building a shared library linking statically against boost)
 	* fixed FreeBSD build
 	* fixed web seed performance issue whith pieces > 1 MiB

docs/manual.rst

@@ -5370,7 +5370,7 @@ the connections are TCP. This works best if uTP connections are not rate limited
 the global rate limiter (which they aren't by default).
 
 ``rate_limit_utp`` determines if uTP connections should be throttled by the global rate
-limiter or not. By default they are not, since uTP manages its own rate.
+limiter or not. By default they are.
 
 ``listen_queue_size`` is the value passed in to listen() for the listen socket.
 It is the number of outstanding incoming connections to queue up while we're not

src/session.cpp

@@ -1261,7 +1261,7 @@ namespace libtorrent
 		, utp_dynamic_sock_buf(true)
 		, utp_loss_multiplier(50) // specified in percent
 		, mixed_mode_algorithm(peer_proportional)
-		, rate_limit_utp(false)
+		, rate_limit_utp(true)
 		, listen_queue_size(5)
 		, announce_double_nat(false)
 		, torrent_connect_boost(10)