Add --usb-path option to select device #122
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This patch adds the --usb-path option as an additional way to filter the
Nitrokey device to connect to. While the serial number is a better
identifier in theory, the Nitrokey Storage devices do not send their
serial number in the USB device descriptor. Having the --usb-path
options allows users to select one of multiple Nitrokey Storage devices.
While we could directly call the nitrokey::Manager::connect_path
function with the specified path, we integrate the --usb-path option
into the existing find_device function for consistent error messages and
to avoid having to duplicate the --model and --serial-number checks.