tools: usb: usbip: Add simple script to show how to setup vUDC

Add some simple script which creates a USB gadget using ConfigFS
and then exports it using vUDC.

This may be useful for people who just started playing with
USB/IP and vUDC as it shows exact steps how to setup all stuff.

Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>
Acked-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>