test/package_sanity.py: ported to pytest (#3474)
test/package_sanity.py: ported to pytest (#3474)


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