Fix chdir and add tests for fsutils functions

[DavidHuber-NOAA]

Description

This modifies chdir so that it produces an error if the target directory is not available and returns to the original working directory when the with completes without producing a warning.

Tests were added to verify that chdir, as well as the other fsutils, run as expected. While writing these tests, the following issues were found and fixed:

• mkdir_p was simplified to use the os.mkdir exist_ok=True parameter instead of attempting to handle that in wxflow.
• Added a missing_ok parameter to rmdir to allow missing directories to be skipped without error.
• Improved rm_p error handling and added a missing_okparameter.

Lastly, the only function that did not have a test added was chgrp. I am not sure what groups are available on GitHub runners, so I am not sure how this could be tested reliably.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New tests

How Has This Been Tested?

• pynorms
• pytests

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• New and existing tests pass with my changes

[aerorahul]

Suggested change

	raise exc
	raise FileNotFoundError()

Should this raise this error specifically. Not sure how this works, if its trying to remove something that is not existant.

[DavidHuber-NOAA]

Since exc is the original FileNotFoundError, raising exc is equivalent to raising FileNotFoundError. But, raising a custom FileNotFoundError with an more specific error message would be useful. I'll add that in.

So if the file doesn't exist, nothing will happen but rmtree will return a FileNotFoundError. If missing_ok=False, then this Exception will be passed on. Otherwise, you get a warning for trying.

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 52.41%. Comparing base (e1ef697) to head (6524b8b).
Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/wxflow/fsutils.py	83.33%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #45      +/-   ##
===========================================
+ Coverage    50.12%   52.41%   +2.29%     
===========================================
  Files           18       18              
  Lines         1652     1679      +27     
  Branches       339      296      -43     
===========================================
+ Hits           828      880      +52     
+ Misses         765      749      -16     
+ Partials        59       50       -9     

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[aerorahul]

lgtm. thanks for beefing up fsutils and adding tests.