test/versions.py: ported to pytest (#3635)
test/versions.py: ported to pytest (#3635)


iulian787/spack,krafczyk/spack,TheTimmy/spack,LLNL/spack,LLNL/spack,lgarren/spack,TheTimmy/spack,krafczyk/spack,tmerrick1/spack,matthiasdiener/spack,mfherbst/spack,skosukhin/spack,LLNL/spack,tmerrick1/spack,krafczyk/spack,lgarren/spack,iulian787/spack,skosukhin/spack,lgarren/spack,LLNL/spack,matthiasdiener/spack,krafczyk/spack,EmreAtes/spack,iulian787/spack,tmerrick1/spack,TheTimmy/spack,mfherbst/spack,lgarren/spack,tmerrick1/spack,EmreAtes/spack,skosukhin/spack,krafczyk/spack,EmreAtes/spack,TheTimmy/spack,skosukhin/spack,mfherbst/spack,EmreAtes/spack,iulian787/spack,iulian787/spack,mfherbst/spack,tmerrick1/spack,matthiasdiener/spack,mfherbst/spack,lgarren/spack,skosukhin/spack,matthiasdiener/spack,matthiasdiener/spack,EmreAtes/spack,LLNL/spack,TheTimmy/spack