Add test case for runexecutor with cputime limit and walltime limit.
Add test case for runexecutor with cputime limit and walltime limit.

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