Add a special function to reset the host usb device.  It tracks the time
needed by the USBDEVFS_RESET ioctl and prints a warning in case it needs
too long.  Usually it should be finished in 200 - 300 miliseconds.
Warning threshold is one second.

Intention is to help troubleshooting by indicating that the usb device
stopped responding even to a reset request and is possibly broken.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>