Bug#920546: dolfin: flaky autopkgtest as it times out sometimes

[Drew Parsons]

Source: dolfin
Followup-For: Bug #920546

It is a bit of a nuisance.  The timeout doesn't happen every time, and
when it does happen, it's hanging on a different MPI test each time.

So not so simple to fix, apart from shutting down all MPI tests but
that seems a step too far. Fortunately the timeouts are not that
common (dolfin's tests are more robust than hypre's).

There is a fragile relationship between openmpi and pmix. I wonder if
the test timeouts might be related to that.  The current new pmix has
broken all mpi tests (by losing track of libpmix.so though, not by
timeouts).

-- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.19.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8), LANGUAGE=en_AU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled