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q_netem: harden extractTcmsgAttributes for truncated/oversized APP payloads

- treat a zero-length APP payload as absent instead of returning
  io.ErrUnexpectedEOF
- fail on APP payloads whose declared length does not match the
  remaining message bytes
- report the truncated attribute explicitly and skip it instead of
  silently continuing
- return an error for unknown attribute kinds that carry an APP
  payload

Signed-off-by: Sebastian Rieger <sebastian.rieger@informatik.hs-fulda.de>