Update function for retrieving the puf file

[hdoupe]

• Read PUF file from the S3 bucket with pandas on CS.
• Add better logging to better tell where the PUF file is read from (i.e. a local file, s3 bucket, or not at all).

cc @jdebacker

[codecov-io]

Codecov Report

Merging #179 (640c587) into master (c5ded60) will decrease coverage by 0.12%. The diff coverage is 65.21%.

@@            Coverage Diff             @@
##           master     #179      +/-   ##
==========================================
- Coverage   82.36%   82.23%   -0.13%     
==========================================
  Files          21       21              
  Lines        1508     1520      +12     
==========================================
+ Hits         1242     1250       +8     
- Misses        266      270       +4     

Flag	Coverage Δ
unittests	82.23% <65.21%> (-0.13%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cs-config/cs_config/helpers.py	48.51% <65.21%> (+1.14%)	:arrow_up:

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[jdebacker]

@hdoupe looks like failure is just with codecov upload. Maybe restart jobs and try again?