[Python-modules-team] Bug#942235: dask: autopkgtest needs update for new version of pytest

[Rebecca N. Palmer]

Ubuntu have dask 2.6.0 and fsspec, but still have a few autopkgtest 
failures:

https://people.canonical.com/~ubuntu-archive/proposed-migration/update_excuses.html

dask itself - looks like trying to use a nonexistent temporary directory
pyfftw - looks like a test treating a new (unexpected) warning as a failure
satpy - looks like a missing dependency on fsspec