Bugfix #2173 main_v10.1 shift_data_plane

[JohnHalleyGotway]

Expected Differences

• Do these changes introduce new tools, command line arguments, or configuration file options? [No]
  
  If yes, please describe:
  

• Do these changes modify the structure of existing or add new output data types (e.g. statistic line types or NetCDF variables)? [No]
  
  If yes, please describe:
  

Pull Request Testing

• Describe testing already performed for these changes:
  
  Manually ran 2 calls to shift_data_plane to confirm that they now work after this change:

bin/shift_data_plane PYTHON_NUMPY out.nc \
'name="scripts/python/read_ascii_numpy.py data/python/fcst.txt FCST";' \
-from 30 -110 -to 35 -115

and

bin/shift_data_plane data/python/fcst.txt out.nc \
'name="scripts/python/read_ascii_numpy.py MET_PYTHON_INPUT_ARG FCST"; file_type=PYTHON_NUMPY;' \
-from 30 -110 -to 35 -115

Produce this shifted output:

• Recommend testing for the reviewer(s) to perform, including the location of input datasets, and any additional instructions:
  
  Review the code changes. Also review the companion PR for the develop branch which will include updates to the unit tests.

• Do these changes include sufficient documentation updates, ensuring that no errors or warnings exist in the build of the documentation? [No]
  No doc changes included or needed.

• Do these changes include sufficient testing updates? [No]
  No testing changes included or needed. Will update the unit tests for the develop branch.

• Will this PR result in changes to the test suite? [No]
  
  If yes, describe the new output and/or changes to the existing output:
  

• Please complete this pull request review by [Fri 6/10/22].
  

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[jprestop]

I reviewed the changes and have ensured that these are the same changes as in the develop branch. I looked at the additions to unit_python.xml for the develop branch PR #2175, confirmed they're the same as listed in the issue #2173, and confirmed that GHA successfully runs them. As expected, the only diff is the addition of two new output files from shift_data_plane. I approve this pull request.