gdb_server: Log both incoming and outgoing GDB packets

- Made sure that also outgoing GDB packets are logged,
  not only the incoming ones.

- Improved the treatment of non-printable characters
  in the packets to make it more robust.

Prior to this change:

- Outgoing packets were not printed unless OpenOCD was
  re-compiled with _DEBUG_GDB_IO_.
- Non-prinable characters were only treated in incoming
  'X' packets.

After this change:

- Both incoming and outgoing GDB packets are logged
  on debug_level >= 3, so that both directions of the
  GDB channel are visible.
- Non-printable characters are checked for in every packet
  so that hey do not interfere with the terminal.

Change-Id: I0613e57ae5059b3279b0abcb71276cf5719a8699
Signed-off-by: Jan Matyas <matyas@codasip.com>
Reviewed-on: http://openocd.zylin.com/6269
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

src/helper/log.h

@@ -100,6 +100,8 @@ char *alloc_vprintf(const char *fmt, va_list ap);
 char *alloc_printf(const char *fmt, ...)
 	__attribute__ ((format (PRINTF_ATTRIBUTE_FORMAT, 1, 2)));
 
+char *find_nonprint_char(char *buf, unsigned buf_len);
+
 extern int debug_level;
 
 /* Avoid fn call and building parameter list if we're not outputting the information.