Removing the _connected field from Client since we don't use it anymore.

Author: damellis

Client.h

@@ -28,7 +28,6 @@ class Client : public Print {
 
 private:
   static uint16_t _srcport;
-  bool _connected;
   uint8_t _sock;
   uint8_t *_ip;
   uint16_t _port;