Common configuration functionality

[rohe]

Common configuration functionality to reside in oidcmsg instead of being duplicated in oidcrp and oidcop

[codecov-commenter]

Codecov Report

Merging #34 (d8ba736) into master (c7a8d42) will increase coverage by 0.52%.
The diff coverage is 77.37%.

❗ Current head d8ba736 differs from pull request most recent head 6c898e8. Consider uploading reports for the commit 6c898e8 to get more accurate results

@@            Coverage Diff             @@
##           master      #34      +/-   ##
==========================================
+ Coverage   66.75%   67.27%   +0.52%     
==========================================
  Files          20       23       +3     
  Lines        2725     2857     +132     
==========================================
+ Hits         1819     1922     +103     
- Misses        906      935      +29     

Impacted Files	Coverage Δ
src/oidcmsg/impexp.py	75.22% <11.11%> (-4.22%)	⬇️
src/oidcmsg/util.py	62.50% <62.50%> (ø)
src/oidcmsg/logging.py	68.18% <68.18%> (ø)
src/oidcmsg/configure.py	86.31% <86.31%> (ø)
src/oidcmsg/__init__.py	51.16% <100.00%> (+1.16%)	⬆️

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