add_and_modified_sdhi-usb_function-ethernet

Hi,
Here are some scripts of sdhi, usb-function and ethernet.
that I added some new scripts of tcp-check in ethernet, suspending g_serial in
usb-function and in sdhi card while reading and writing.
Modified udp check in order to change file name and make python code clearly.
Modified g_ether and g_serial in usb-function to confirm device interface before run
and change the way of testing g_serial.
Please see it and push it up to your branch, or tell me know if you want me to modified
any thing.

Best Regards,
CAO MINH HIEP.

Signed-off-by: Hiep Cao Minh <cm-hiep@jinso.co.jp>