(parse_ccid_descriptor): Make SCM workaround

reader type specific.
(scan_or_find_devices): Do not check the interface subclass in the
SPR532 kludge, as this depends on the firmware version.
(ccid_get_atr): Get the Slot status first.  This solves the
problem with readers hanging on recent Linux 2.6.x.
(bulk_in): Add argument TIMEOUT and changed all callers to pass an
appropriate one.  Change the standard timeout from 10 to 5 seconds.
(ccid_slot_status): Add a retry code with an initial short timeout.
(do_close_reader): Do an usb_reset before closing the reader.

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