usb: -usbdevice cleanups, storage fix, QOMify ccid.

# gpg: Signature made Fri 26 Jan 2018 08:04:49 GMT
# gpg:                using RSA key 0x4CB6D8EED3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>"
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>"
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>"
# Primary key fingerprint: A032 8CFF B93A 17A7 9901  FE7D 4CB6 D8EE D3E8 7138

* remotes/kraxel/tags/usb-20180126-v3-pull-request:
  usb-ccid: convert CCIDCardClass::exitfn() -> unrealize()
  usb-ccid: inline ccid_card_initfn() in ccid_card_realize()
  hw/usb/ccid: Make ccid_card_init() take an error parameter
  usb-storage: Fix share-rw option parsing
  usb: Remove legacy -usbdevice options (host, serial, disk and net)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>