Homogenize parameter-naming for retries

[knoepfel]

This PR fixes #253. It includes the following changes:

• For source proxy: retries -> max_attempts, retry_timeout -> retry_interval
• Otherwise, nretries -> max_retries

[codecov]

Codecov Report

Merging #372 (0dbfb9b) into master (ee7d45c) will not change coverage.
The diff coverage is 92.30%.

@@           Coverage Diff           @@
##           master     #372   +/-   ##
=======================================
  Coverage   36.26%   36.26%           
=======================================
  Files          80       80           
  Lines        3444     3444           
  Branches      576      576           
=======================================
  Hits         1249     1249           
  Misses       2104     2104           
  Partials       91       91           

Flag	Coverage Δ
python-3.6	36.16% <92.30%> (ø)
python-3.9	36.26% <92.30%> (ø)

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

Impacted Files	Coverage Δ
...modules/AWS/sources/AWSOccupancyWithSourceProxy.py	69.69% <ø> (ø)
...modules/AWS/sources/AWSSpotPriceWithSourceProxy.py	69.89% <ø> (ø)
...ngine_modules/NERSC/sources/NerscAllocationInfo.py	85.00% <ø> (ø)
...cisionengine_modules/NERSC/sources/NerscJobInfo.py	83.33% <ø> (ø)
src/decisionengine_modules/util/retry_function.py	65.51% <80.00%> (ø)
src/decisionengine_modules/NERSC/util/newt.py	34.28% <100.00%> (ø)
...gine_modules/glideinwms/sources/factory_entries.py	86.53% <100.00%> (ø)
...ngine_modules/glideinwms/sources/factory_global.py	77.27% <100.00%> (ø)
...ionengine_modules/htcondor/publishers/publisher.py	44.76% <100.00%> (ø)
...decisionengine_modules/util/test_retry_function.py	100.00% <100.00%> (ø)

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