fix mem leak detect bug, destroy server when quit

@@ -311,6 +311,11 @@ SrsServer::SrsServer()
 
 SrsServer::~SrsServer()
 {
+    destroy();
+}
+
+void SrsServer::destroy()
+{
     _srs_config->unsubscribe(this);
     
     if (true) {
@@ -539,6 +544,8 @@ int SrsServer::cycle()
     ingester->stop();
 #endif
 
+    destroy();
+    
     return ret;
 }
 

@@ -128,6 +128,7 @@ private:
 public:
     SrsServer();
     virtual ~SrsServer();
+    virtual void destroy();
 public:
     virtual int initialize();
     virtual int initialize_signal();