revert "fixes for RTS/DTR handling on open", bad solution

- with the patch, control lines have wrong initial state on posix
- makes no difference on win32, execpt add code
diff --git a/serial/serialutil.py b/serial/serialutil.py
index 80416ea..05ebd87 100644
--- a/serial/serialutil.py
+++ b/serial/serialutil.py
@@ -154,8 +154,8 @@
         self._dsrdtr = None
         self._inter_byte_timeout = None
         self._rs485_mode = None  # disabled by default
-        self._rts_state = None
-        self._dtr_state = None
+        self._rts_state = True
+        self._dtr_state = True
         self._break_state = False
 
         # assign values using get/set methods using the properties feature