make a zedboot USB key
usage: fx mkzedboot-remote HOST [DIR] [--no-build] [--no-check-ssh-keys] --usb USB_DEVICE [--force] --no-build do not build, just pull artifacts already present --no-check-ssh-keys do not verify that the default SSH credentials are the same before paving. HOST the hostname to connect to DIR defaults to ~/fuchsia, the path to the FUCHSIA_DIR on HOST --force force writing to a non-usb target HOST and DIR are persisted in the file //.fx-remote-config and are reused as defaults in future invocations of any 'fx *-remote' tools.