[$] Challenges with fstests and blktests

The challenges of testing filesystems and the block layer were the topic of acombined storage and filesystem session led by Luis Chamberlain at the2022 Linux Storage,Filesystem, Memory-management and BPF Summit (LSFMM). His goal is toreduce the amount of time it takes to test new features in those areas, butone of the problems that he has encountered is a lack of determinism in thetest results. It is sometimes hard to distinguish problems in the kernelcode from problems in the tests themselves.