fix feature of truncating log files to a maximum size for Python 3
fix feature of truncating log files to a maximum size for Python 3

michkot/benchexec,martin-neuhaeusser/benchexec,dbeyer/benchexec,sosy-lab/benchexec,IljaZakharov/benchexec,bjowac/impara-benchexec,martin-neuhaeusser/benchexec,sosy-lab/benchexec,cheshire/benchexec,dbeyer/benchexec,sosy-lab/benchexec,ultimate-pa/benchexec,cheshire/benchexec,michkot/benchexec,ultimate-pa/benchexec,ultimate-pa/benchexec,dbeyer/benchexec,ultimate-pa/benchexec,bjowac/impara-benchexec,michkot/benchexec,ultimate-pa/benchexec,bjowac/impara-benchexec,IljaZakharov/benchexec,dbeyer/benchexec,sosy-lab/benchexec,ultimate-pa/benchexec,IljaZakharov/benchexec,IljaZakharov/benchexec,martin-neuhaeusser/benchexec,martin-neuhaeusser/benchexec,sosy-lab/benchexec,cheshire/benchexec,sosy-lab/benchexec