Fix ValueError when using ResourceMonitor

[HippocampusGirl]

Summary

When running Nipype 1.7.0 with enable_resource_monitor, I get the following error:

Traceback (most recent call last):
  File "/usr/local/miniconda/lib/python3.8/site-packages/halfpipe/plugins/linear.py", line 45, in run
    node.run(updatehash=updatehash)
  File "/usr/local/miniconda/lib/python3.8/site-packages/nipype/pipeline/engine/nodes.py", line 521, in run
    result = self._run_interface(execute=True)
  File "/usr/local/miniconda/lib/python3.8/site-packages/nipype/pipeline/engine/nodes.py", line 639, in _run_interface
    return self._run_command(execute)
  File "/usr/local/miniconda/lib/python3.8/site-packages/nipype/pipeline/engine/nodes.py", line 715, in _run_command
    result = self._interface.run(cwd=outdir, ignore_exception=True)
  File "/usr/local/miniconda/lib/python3.8/site-packages/nipype/interfaces/base/core.py", line 398, in run
    runtime = self._run_interface(runtime)
  File "/usr/local/miniconda/lib/python3.8/site-packages/nipype/interfaces/base/support.py", line 90, in __exit__
    for k, v in self._resmon.stop():
ValueError: too many values to unpack (expected 2)

List of changes proposed in this PR (pull-request)

• Unpack the dictionary returned by self._resmon.stop() into items for the for loop

Acknowledgment

• (Mandatory) I acknowledge that this contribution will be available under the Apache 2 license.

[codecov]

Codecov Report

Merging #3419 (c945fd4) into master (f756b71) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master    #3419   +/-   ##
=======================================
  Coverage   65.21%   65.21%           
=======================================
  Files         307      307           
  Lines       40474    40474           
  Branches     5351     5351           
=======================================
  Hits        26395    26395           
  Misses      13004    13004           
  Partials     1075     1075           

Flag	Coverage Δ
unittests	64.95% <0.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
nipype/interfaces/base/support.py	82.19% <0.00%> (ø)

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[effigies]

LGTM.