[GSOC 2017] Add usbdump file-format to Wireshark, week 1-2

[Jie Weng]

Hi all,

I was learning the development of wiretap lib in Wireshark these two weeks
by reading
the source code.

To make Wireshark support the usbdump file format, the first step is to add
support to
open and handle the dumped file. To achieve this, three key routine is
required:
usbdump_open, usbdump_read, and usbdump_seek_read, by now I've almost
finished
the usbdump_open routine.

the code is hosted at https://github.com/jerrywossion/usbdump-wireshark.

Best regards,
Jie Weng