Data set manager utils cleanup

[hackdna]

Remove unused functions

[codecov]

Codecov Report

Merging #3009 into develop will decrease coverage by 0.6%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #3009      +/-   ##
===========================================
- Coverage    60.14%   59.53%   -0.61%     
===========================================
  Files          433      433              
  Lines        28189    27154    -1035     
  Branches      1275     1275              
===========================================
- Hits         16953    16166     -787     
+ Misses       11236    10988     -248

Impacted Files	Coverage Δ
refinery/data_set_manager/utils.py	84.28% <ø> (+1.98%)	⬆️
refinery/core/forms.py	79.41% <0%> (-5.89%)	⬇️
refinery/core/views.py	42.94% <0%> (-5.06%)	⬇️
refinery/core/models.py	75.61% <0%> (-2.11%)	⬇️
refinery/core/utils.py	37.1% <0%> (-0.38%)	⬇️
refinery/core/test_views.py	100% <0%> (ø)	⬆️

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[scottx611x]

@hackdna Looks fine to me. Not sure if the get_node_attributes* functions would be useful to @jkmarx with the FileBrowser cell editing work or not.

[jkmarx]

I'm all set and wouldn't use that method. Thanks though.