Refactor Make Numpy Array

[NihalHarish]

Description of changes:

• Refactors code to make a single implementation of make_numpy_array

Style and formatting:

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Issue number, if available

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[codecov-commenter]

Codecov Report

Merging #329 into master will decrease coverage by 1.73%. The diff coverage is 96.00%.

@@            Coverage Diff             @@
##           master     #329      +/-   ##
==========================================
- Coverage   87.24%   85.50%   -1.74%     
==========================================
  Files          86       86              
  Lines        6474     6457      -17     
==========================================
- Hits         5648     5521     -127     
- Misses        826      936     +110     

Impacted Files	Coverage Δ
smdebug/core/tfevent/util.py	100.00% <ø> (ø)
smdebug/pytorch/utils.py	18.51% <ø> (-30.20%)	:arrow_down:
smdebug/core/utils.py	83.56% <92.30%> (+0.56%)	:arrow_up:
smdebug/core/tfevent/summary.py	81.35% <100.00%> (-15.26%)	:arrow_down:
smdebug/mxnet/hook.py	93.02% <100.00%> (+0.16%)	:arrow_up:
smdebug/mxnet/utils.py	59.37% <100.00%> (-31.54%)	:arrow_down:
smdebug/pytorch/hook.py	82.40% <100.00%> (+1.25%)	:arrow_up:
smdebug/tensorflow/base_hook.py	80.55% <100.00%> (+0.31%)	:arrow_up:
smdebug/tensorflow/session.py	91.82% <100.00%> (-0.04%)	:arrow_down:
smdebug/xgboost/hook.py	87.71% <100.00%> (ø)
... and 20 more

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