[ENH] Minor Xvfb and MultiProcPlugin cleanups

[effigies]

Quick follow-up to #2200, #2203, #2208.

Changes proposed in this pull request

• Use relative import to ensure the correct nipype's config is being imported
• Remember MultiProcPlugin._send_proc_to_workers stats between calls to reduce noise

[mgxd]

I was just about to comment about _send_procs_to_workers but you beat me to the punch :)

[effigies]

Added a bunch of make specs updates that got missed in #2200.

@mgxd Let me know if there are any other cleanups that should go in with this.

[mgxd]

LGTM - one little thing that could be useful is supplementing the information when running a Function interface here.

Currently, this is output in the log

171005-16:29:28,86 workflow INFO:
	 Running a "Function" interface.
171005-16:29:28,113 workflow INFO:
	 Running a "Function" interface.

which is nice, but maybe we can add the node/function name in this case to get a better understanding?

This could also be addressed in an add-on PR

[effigies]

What do you think of 5b367f2?

[oesteban]

Hopefully this will polish those little things here and there. Thanks a lot @effigies

[effigies]

Reviewed Oscar's changes. I'm +1 to merge if tests pass.

[codecov-io]

Codecov Report

Merging #2211 into master will increase coverage by <.01%.
The diff coverage is 85.1%.

@@            Coverage Diff            @@
##           master   #2211      +/-   ##
=========================================
+ Coverage    72.3%   72.3%   +<.01%     
=========================================
  Files        1178    1178              
  Lines       58736   58768      +32     
  Branches     8456    8458       +2     
=========================================
+ Hits        42468   42494      +26     
- Misses      14896   14901       +5     
- Partials     1372    1373       +1

Flag	Coverage Δ
#smoketests	72.3% <85.1%> (ø)	⬆️
#unittests	69.85% <82.97%> (ø)	⬆️

Impacted Files	Coverage Δ
...ipype/interfaces/afni/tests/test_auto_ABoverlap.py	85.71% <ø> (ø)	⬆️
nipype/interfaces/afni/tests/test_auto_Despike.py	85.71% <ø> (ø)	⬆️
nipype/interfaces/afni/tests/test_auto_Qwarp.py	85.71% <ø> (ø)	⬆️
nipype/interfaces/afni/tests/test_auto_Unifize.py	85.71% <ø> (ø)	⬆️
...ype/interfaces/afni/tests/test_auto_AFNICommand.py	100% <ø> (ø)	⬆️
nipype/interfaces/afni/tests/test_auto_Copy.py	85.71% <ø> (ø)	⬆️
nipype/interfaces/afni/tests/test_auto_TNorm.py	85.71% <ø> (ø)	⬆️
nipype/interfaces/afni/tests/test_auto_ECM.py	85.71% <ø> (ø)	⬆️
nipype/interfaces/afni/tests/test_auto_Bandpass.py	85.71% <ø> (ø)	⬆️
nipype/interfaces/afni/tests/test_auto_Merge.py	85.71% <ø> (ø)	⬆️
... and 50 more

---

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[codecov-io]

Codecov Report

Merging #2211 into master will not change coverage.
The diff coverage is 85.1%.

@@          Coverage Diff           @@
##           master   #2211   +/-   ##
======================================
  Coverage    72.3%   72.3%           
======================================
  Files        1178    1178           
  Lines       58768   58768           
  Branches     8458    8458           
======================================
  Hits        42494   42494           
  Misses      14901   14901           
  Partials     1373    1373

Flag	Coverage Δ
#smoketests	72.3% <85.1%> (ø)	⬆️
#unittests	69.85% <82.97%> (ø)	⬆️

Impacted Files	Coverage Δ
nipype/interfaces/afni/tests/test_auto_Qwarp.py	85.71% <ø> (ø)	⬆️
nipype/interfaces/afni/tests/test_auto_Detrend.py	85.71% <ø> (ø)	⬆️
nipype/interfaces/afni/tests/test_auto_Axialize.py	85.71% <ø> (ø)	⬆️
nipype/interfaces/afni/tests/test_auto_TCorrMap.py	85.71% <ø> (ø)	⬆️
nipype/interfaces/afni/tests/test_auto_Unifize.py	85.71% <ø> (ø)	⬆️
...ype/interfaces/afni/tests/test_auto_AFNICommand.py	100% <ø> (ø)	⬆️
nipype/interfaces/afni/tests/test_auto_Edge3.py	85.71% <ø> (ø)	⬆️
nipype/interfaces/afni/tests/test_auto_Despike.py	85.71% <ø> (ø)	⬆️
...ipype/interfaces/afni/tests/test_auto_ABoverlap.py	85.71% <ø> (ø)	⬆️
nipype/interfaces/afni/tests/test_auto_SVMTrain.py	85.71% <ø> (ø)	⬆️
... and 107 more

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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