usb: make attach optional.
Add a auto_attach field to USBDevice, which is enabled by default. USB drivers can clear this field in case they do *not* want the device being attached (i.e. plugged into a usb port) automatically after successfull init(). Use cases (see next patches): * attaching encrypted mass storage devices. * -usbdevice host:... Signed-off-by: NGerd Hoffmann <kraxel@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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