pick 3 routers for SSU2 peer test

libi2pd/SSU2.cpp

@@ -463,6 +463,7 @@ namespace transport
 			bool isValidEndpoint = !address->host.is_unspecified () && address->port;
 			if (isValidEndpoint)
 			{	
+				if (i2p::util::net::IsInReservedRange(address->host)) return false;
 				auto s = FindPendingOutgoingSession (boost::asio::ip::udp::endpoint (address->host, address->port));
 				if (s)
 				{	

libi2pd/SSU2Session.cpp

@@ -1712,7 +1712,9 @@ namespace transport
 					}
 					else
 					{
-						LogPrint (eLogInfo, "SSU2: Peer test 4 error code ", (int)buf[1]);
+						LogPrint (eLogInfo, "SSU2: Peer test 4 error code ", (int)buf[1], " from ",
+							i2p::data::GetIdentHashAbbreviation (buf[1] < 64 ? GetRemoteIdentity ()->GetIdentHash () : i2p::data::IdentHash (buf + 3)));
+						if (GetRouterStatus () == eRouterStatusTesting)
 							SetRouterStatus (eRouterStatusUnknown);
 						it->second.first->Terminate ();
 					}	

libi2pd/Transports.cpp

@@ -665,11 +665,16 @@ namespace transport
 			{
 				excluded.clear ();
 				excluded.insert (i2p::context.GetIdentHash ());
+				for (int i = 0; i < 3; i++)
+				{	
 					auto router = i2p::data::netdb.GetRandomSSU2PeerTestRouter (true, excluded); // v4
 					if (router)
 					{
+						if (i2p::context.GetStatus () != eRouterStatusTesting)
 							i2p::context.SetStatusSSU2 (eRouterStatusTesting);
 						m_SSU2Server->StartPeerTest (router, true);
+						excluded.insert (router->GetIdentHash ());
+					}	
 				}	
 			}	
 		}
@@ -708,12 +713,17 @@ namespace transport
 			{
 				excluded.clear ();
 				excluded.insert (i2p::context.GetIdentHash ());
+				for (int i = 0; i < 3; i++)
+				{	
 					auto router = i2p::data::netdb.GetRandomSSU2PeerTestRouter (false, excluded); // v6
 					if (router)
 					{
+						if (i2p::context.GetStatusV6 () != eRouterStatusTesting)
 							i2p::context.SetStatusV6SSU2 (eRouterStatusTesting);
 						m_SSU2Server->StartPeerTest (router, false);
 					}
+					excluded.insert (router->GetIdentHash ());
+				}	
 			}	
 		}
 	}