rework initialization order a little, try to start torrents after dht comes up

src/twister.cpp

@@ -161,7 +161,18 @@ void ThreadWaitExtIP()
     settings.anonymous_mode = false; // (false => send peer_id, avoid connecting to itself)
     ses->set_settings(settings);
 
+    printf("libtorrent + dht started\n");
+
+    // wait up to 10 seconds for dht nodes to be set
+    for( int i = 0; i < 10; i++ ) {
+        MilliSleep(1000);
+        session_status ss = ses->status();
+        if( ss.dht_nodes )
+            break;
+    }
 
+    {
+        LOCK(cs_twister);
         boost::filesystem::path userDataPath = GetDataDir() / "user_data";
         loadUserData(userDataPath.string(), m_users);
         printf("loaded user_data for %zd users\n", m_users.size());
@@ -174,8 +185,7 @@ void ThreadWaitExtIP()
                 startTorrentUser(username);
             }
         }
-
-    printf("libtorrent + dht started\n");
+    }
 }
 
 void ThreadMaintainDHTNodes()
@@ -183,7 +193,7 @@ void ThreadMaintainDHTNodes()
     RenameThread("maintain-dht-nodes");
 
     while(1) {
-        MilliSleep(15000);
+        MilliSleep(5000);
 
         bool nodesAdded = false;
         if( ses ) {