returning list instead of dict keys

[Vikas-kum]

fix in return of _get_sm_tj_jobs_with_prefix . This function should return list always.

Description of changes:

Style and formatting:

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Issue number, if available

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[codecov-io]

Codecov Report

Merging #376 into master will increase coverage by 1.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #376      +/-   ##
==========================================
+ Coverage   85.47%   86.49%   +1.01%     
==========================================
  Files          86       86              
  Lines        6507     6507              
==========================================
+ Hits         5562     5628      +66     
+ Misses        945      879      -66     

Impacted Files	Coverage Δ
smdebug/rules/action/stop_training_action.py	77.41% <100.00%> (ø)
smdebug/trials/trial.py	97.11% <0.00%> (+0.28%)	:arrow_up:
smdebug/core/index_reader.py	90.51% <0.00%> (+0.43%)	:arrow_up:
smdebug/core/collection_manager.py	93.90% <0.00%> (+1.21%)	:arrow_up:
smdebug/core/utils.py	84.97% <0.00%> (+1.40%)	:arrow_up:
smdebug/core/access_layer/s3handler.py	70.19% <0.00%> (+1.98%)	:arrow_up:
smdebug/core/reductions.py	97.82% <0.00%> (+4.34%)	:arrow_up:
smdebug/core/tensor.py	85.08% <0.00%> (+6.04%)	:arrow_up:
smdebug/mxnet/collection.py	83.33% <0.00%> (+6.66%)	:arrow_up:
smdebug/core/tfrecord/record_reader.py	86.00% <0.00%> (+8.00%)	:arrow_up:
... and 5 more

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