Update test failure output: don't include the entire build log, just lines which mention errors (or if no such lines can be found, output the last 10 lines from the log).
Update test failure output: don't include the entire build log, just lines which
mention errors (or if no such lines can be found, output the last 10 lines from
the log).

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