lint some files

[leon1995]

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have updated the changelog accordingly.
• I have added tests to cover my changes.

[codecov]

Codecov Report

❌ Patch coverage is 94.31579% with 27 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.27%. Comparing base (0f99003) to head (6ffacd9).

Files with missing lines	Patch %	Lines
src/sdc11073/httpserver/httprequesthandler.py	62.50%	9 Missing ⚠️
src/sdc11073/provider/subscriptionmgr.py	41.66%	7 Missing ⚠️
src/sdc11073/httpserver/httpreader.py	58.33%	5 Missing ⚠️
src/sdc11073/xml_types/basetypes.py	85.71%	3 Missing ⚠️
...c11073/provider/porttypes/stateeventserviceimpl.py	90.90%	2 Missing ⚠️
src/sdc11073/loghelper.py	97.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #497      +/-   ##
==========================================
+ Coverage   92.04%   92.27%   +0.22%     
==========================================
  Files         106      106              
  Lines       12110    12095      -15     
==========================================
+ Hits        11147    11161      +14     
+ Misses        963      934      -29     

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[a-kleinf]

please also clean up:

src/sdc11073/provider/porttypes/descriptioneventserviceimpl.py
src/sdc11073/provider/porttypes/stateeventserviceimpl.py
src/sdc11073/provider/porttypes/waveformserviceimpl.py