FIX: Print UID in crashfile if login name is unavailable

[effigies]

Related: nipreps/fmriprep#1060

Changes proposed in this pull request

• Use a stand-in login name of UID<UID> if getpass.getuser() fails.

We had a user use the -u flag for Docker, which allowed them to run fMRIPrep and get outputs owned by their local user. If that UID doesn't exist for a user within the container, getpass.getuser() fails, and crashfiles cannot be written properly.

[satra]

lgtm

[effigies]

DARTEL was timing out again, so I killed it. Can rebase this to re-run if needed.

[codecov-io]

Codecov Report

Merging #2563 into master will decrease coverage by 0.02%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master    #2563      +/-   ##
==========================================
- Coverage   67.13%   67.11%   -0.03%     
==========================================
  Files         333      333              
  Lines       42539    42542       +3     
  Branches     5265     5265              
==========================================
- Hits        28559    28551       -8     
- Misses      13278    13284       +6     
- Partials      702      707       +5

Flag	Coverage Δ
#smoketests	50.36% <0%> (-0.35%)	⬇️
#unittests	64.47% <50%> (-0.05%)	⬇️

Impacted Files	Coverage Δ
nipype/pipeline/plugins/tools.py	84.93% <50%> (-2.22%)	⬇️
nipype/info.py	80.59% <0%> (-4.48%)	⬇️
nipype/workflows/fmri/spm/preprocess.py	70.4% <0%> (-2.05%)	⬇️
nipype/utils/provenance.py	83.43% <0%> (-1.28%)	⬇️
nipype/pipeline/engine/nodes.py	83.96% <0%> (-0.34%)	⬇️
nipype/utils/profiler.py	44.25% <0%> (+1.14%)	⬆️

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