Revert Commits That Disable Pytorch Tests For 1.7

[NihalHarish]

Description of changes:

• Reverts two commits that had disabled Pytorch 1.7 ZCC tests

Style and formatting:

I have run pre-commit install to ensure that auto-formatting happens with every commit.

Issue number, if available

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[codecov-io]

Codecov Report

Merging #390 (071b05d) into master (7c5c8c4) will decrease coverage by 1.38%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #390      +/-   ##
==========================================
- Coverage   66.25%   64.87%   -1.39%     
==========================================
  Files         173      163      -10     
  Lines       13275    12929     -346     
==========================================
- Hits         8796     8388     -408     
- Misses       4479     4541      +62     

Impacted Files	Coverage Δ
smdebug/tensorflow/utils.py	63.03% <0.00%> (-23.23%)	:arrow_down:
smdebug/tensorflow/callable_cache.py	60.86% <0.00%> (-21.74%)	:arrow_down:
smdebug/tensorflow/singleton_utils.py	83.33% <0.00%> (-16.67%)	:arrow_down:
smdebug/tensorflow/collection.py	84.53% <0.00%> (-11.35%)	:arrow_down:
smdebug/tensorflow/keras.py	78.43% <0.00%> (-10.86%)	:arrow_down:
smdebug/tensorflow/base_hook.py	74.63% <0.00%> (-3.68%)	:arrow_down:
smdebug/tensorflow/session.py	88.46% <0.00%> (-3.37%)	:arrow_down:
smdebug/core/collection_manager.py	90.24% <0.00%> (-2.44%)	:arrow_down:
smdebug/core/collection.py	87.38% <0.00%> (-1.81%)	:arrow_down:
smdebug/tensorflow/tensor_ref.py	87.09% <0.00%> (-1.62%)	:arrow_down:
... and 14 more

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