Description: yaSSL uses vio_read/vio_write for
             receiving/sending data from/to socket.

             vio_read employs customized timeout
             in case of EAGAIN/EWOULDBLOCK and returns
             -1.

             However, yaSSL function processReply
             does not treat this as error in reading
             data and simply returns.

             This causes upper layer attempting to read
             until socket becomes invalid. This patch
             fixes this issue by raising an error when
             vio_read reports timeout.