补充rsEngine的stop方法，修复ctpGateway关于期权类型的映射问题

vnpy/trader/app/rpcService/rsEngine.py

@@ -88,6 +88,6 @@ class RsEngine(object):
     #----------------------------------------------------------------------
     def stop(self):
         """停止"""
-        pass
+        self.server.stop()
         
     

vnpy/trader/gateway/ctpGateway/ctpGateway.py

@@ -802,12 +802,13 @@ class CtpTdApi(TdApi):
         contract.underlyingSymbol = data['UnderlyingInstrID']
 
         contract.productClass = productClassMapReverse.get(data['ProductClass'], PRODUCT_UNKNOWN)
-
+        
         # 期权类型
-        if data['OptionsType'] == '1':
-            contract.optionType = OPTION_CALL
-        elif data['OptionsType'] == '2':
-            contract.optionType = OPTION_PUT
+        if contract.productClass is PRODUCT_OPTION:
+            if data['OptionsType'] == '1':
+                contract.optionType = OPTION_CALL
+            elif data['OptionsType'] == '2':
+                contract.optionType = OPTION_PUT
 
         # 缓存代码和交易所的印射关系
         self.symbolExchangeDict[contract.symbol] = contract.exchange