- Probe UICLASS_CDC/UISUBCLASS_ABSTRACT_CONTROL_MODEL/0xff again. This

  variant of Microsoft RNDIS, i. e. their unofficial version of CDC ACM,
  has been disabled in r261544 for resolving a conflict with umodem(4).
  Eventually, in r275790 that problem was dealt with in the right way.
  However, r275790 failed to put probing of RNDIS devices in question
  back.
- Initialize the device prior to querying it, as required by the RNDIS
  specification. Otherwise already determining the MAC address may fail
  rightfully.
- On detach, halt the device again.
- Use UCDC_SEND_ENCAPSULATED_{COMMAND,RESPONSE}. While these macros are
  resolving to the same values as UR_{CLEAR_FEATURE,GET_STATUS}, the
  former set is way more appropriate in this context.
- Report unknown - rather: unimplemented - events unconditionally and
  not just in debug mode. This ensures that we'll get some hint of what
  is going wrong instead of the driver silently failing.
- Deal with the Microsoft ActiveSync requirement of using an input buffer
  the size of the expected reply or larger - except for variably sized
  replies - when querying a device.
- Fix some pointless NULL checks, style bugs etc.

This changes allow urndis(4) to communicate with a Microsoft-certified
USB RNDIS test token.

MFC after:	3 days
Sponsored by:	genua mbh

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