fix: add junitxml option to default pytest options

[sebclrsn]

Addresses #313

-> junit report is complete again: https://ci.eclipse.org/kiso-testing/job/kiso-testing/job/PR-321/1/testReport/

[codecov]

Codecov Report

Merging #321 (9c28bdc) into master (d803a32) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #321   +/-   ##
=======================================
  Coverage   96.98%   96.98%           
=======================================
  Files          84       84           
  Lines        6623     6630    +7     
=======================================
+ Hits         6423     6430    +7     
  Misses        200      200           

Impacted Files	Coverage Δ
src/pykiso/interfaces/dt_auxiliary.py	100.00% <100.00%> (ø)
src/pykiso/lib/auxiliaries/proxy_auxiliary.py	100.00% <100.00%> (ø)
src/pykiso/lib/connectors/cc_pcan_can.py	95.43% <100.00%> (+0.04%)	⬆️

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