Unify lxml.etree import

[a-kleinf]

Unified import via "from lxml import etree" (No tests or an update of the changelog is needed since no feature was implemented)

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

Attention: Patch coverage is 94.65241% with 10 lines in your changes missing coverage. Please review.

Project coverage is 90.85%. Comparing base (a55b40b) to head (aa5762a).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/sdc11073/schema_resolver.py	81.81%	2 Missing ⚠️
src/sdc11073/xml_types/xml_structure.py	94.44%	2 Missing ⚠️
src/sdc11073/consumer/consumerimpl.py	50.00%	1 Missing ⚠️
src/sdc11073/namespaces.py	90.00%	1 Missing ⚠️
src/sdc11073/provider/porttypes/porttypebase.py	95.65%	1 Missing ⚠️
src/sdc11073/provider/subscriptionmgr_async.py	50.00%	1 Missing ⚠️
src/sdc11073/provider/subscriptionmgr_base.py	75.00%	1 Missing ⚠️
src/sdc11073/pysoap/soapclient.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #397      +/-   ##
==========================================
- Coverage   90.86%   90.85%   -0.02%     
==========================================
  Files         116      116              
  Lines       12963    12963              
==========================================
- Hits        11779    11777       -2     
- Misses       1184     1186       +2     

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