Bugfix release

• [BUGFIX] Do not abort conn on STREAM frame for a reset stream
• [BUGFIX] Drop packets that would become empty due to repackaging.
  Packets on the scheduled queue may be marked for repackaging.
  Frames such as ACK frame that are never resent are removed from
  repackaged packets. We must check that the newly repackaged packet
  would not be empty. If it would be, it is destroyed instead and
  the next packet on the scheduled queue is used. Note that this
  change only affects the logic to return the next packet to be sent.
  Lost packets that are being rescheduled are already processed in
  this fashion.
• Byteswap CID before logging it - this makes it match Chrome CIDs.
  (Except Q035, which is the last little-endian GQUIC version we
  support.)