Changed the way how is tested whether tarball is successfully unpakced.
Changed the way how is tested whether tarball is successfully unpakced.

andersbll/vlbenchmarks,andersbll/vlbenchmarks,vlfeat/vlbenchmarks,vlfeat/vlbenchmarks,CVML/vlbenchmarks,vlfeat/vlbenchmarks,andersbll/vlbenchmarks,andersbll/vlbenchmarks,CVML/vlbenchmarks,CVML/vlbenchmarks