midway fixes:

  1. fix possible hang in en_txlaunch().   when attempting to extend
        the length of an mbuf to avoid a flush we should extend it
        by cnt [which is ((need - len) % 4)] rather than 4 - cnt.
        also, add an EN_DEBUG printf() when we pad/FLUSH a buffer
        to help with debugging/understanding what the driver is up to.
  2. use interface packet counters
  3. when turning off a recv VCI we recompute the new mode.   make sure
        we don't include the "in service" bit in the new mode, otherwise
        a VCI may appear "hung" if you turn it off while a service
        interrupt is pending.
  4. when shutting down a VCI that is still receiving data, don't bother
        going into "drain mode" if only the hardware in service bit is
        set (otherwise the VCI may get "hung" in drain mode).
        as a result of this we may get "unexpected rx interrupt" messages
        which are not really an error, so put this printf in EN_DEBUG.
  5. be sure to zero txspeed[lcv] when enabling a VCI (start at full
        speed).   (hooks for setting txspeed[] are currently not in
        the driver, but we are playing with it locally).
credits:
        #1: Detected by: Zdenek Salvet <salvet@horn.ics.muni.cz>, fix by me.
        #2: Contributed by: Zdenek Salvet <salvet@horn.ics.muni.cz>
        #3,#4,#5: Detected by: Milind M. Buddhikot <milind@dworkin.wustl.edu>,
                fixed by me.

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