If we say that the version format should be the same for the `version_lowest`
and the `version_bootloader` then it does not always make sense to set it at
the same time.
Moving the `version_format` to a standalone first-class property also means it
can be typically be set in the custom device `_init()` function, which means we
don't need to worry about *changing* ther version format as set by the USB and
UDev superclass helpers.
Some logitech devices seem to reboot immediately and the failures then
look like a broken pipe, but are actually the device rebooting.
If the device really did fail to detach after the timeout is done we'll
see a message that the device failed to come back instead.
