move assetsconnector threads to whatchdog; Abort all alive threads known to watchdog before exit

OpenSim/Framework/Monitoring/Watchdog.cs

@@ -180,6 +180,30 @@ namespace OpenSim.Framework.Monitoring
             m_watchdogTimer.Elapsed += WatchdogTimerElapsed;
         }
 
+        public static void Stop()
+        {
+            if(m_threads == null)
+                return;
+
+            lock(m_threads)
+            {
+                m_enabled = false;            
+                if(m_watchdogTimer != null)
+                {
+                    m_watchdogTimer.Dispose();
+                    m_watchdogTimer = null;
+                }
+            
+                foreach(ThreadWatchdogInfo twi in m_threads.Values)
+                {
+                    Thread t = twi.Thread;
+                    if(t.IsAlive)
+                        t.Abort();
+                }
+                m_threads.Clear();
+            }
+        }
+
         /// <summary>
         /// Add a thread to the watchdog tracker.
         /// </summary>

OpenSim/Framework/Monitoring/WorkManager.cs

@@ -85,6 +85,7 @@ namespace OpenSim.Framework.Monitoring
         public static void Stop()
         {
             JobEngine.Stop();
+            Watchdog.Stop();
         }
 
         /// <summary>

OpenSim/Framework/Servers/BaseOpenSimServer.cs

@@ -119,9 +119,10 @@ namespace OpenSim.Framework.Servers
 
             Thread.Sleep(1000);
             RemovePIDFile();
+
             m_log.Info("[SHUTDOWN]: Shutdown processing on main thread complete.  Exiting...");
 
-            if (!SuppressExit)
+           if (!SuppressExit)
                 Environment.Exit(0);
         }