Tests: force disconnect from virtual busses on tearDown() (fixes #530)

[erlend-aasland]

No description provided.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.90%. Comparing base (932c621) to head (40a5141).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #535      +/-   ##
==========================================
- Coverage   71.10%   70.90%   -0.20%     
==========================================
  Files          26       26              
  Lines        3111     3111              
  Branches      526      526              
==========================================
- Hits         2212     2206       -6     
- Misses        769      778       +9     
+ Partials      130      127       -3     

see 2 files with indirect coverage changes

[acolomb]

This seems to cut about half the time for build checks. Still would prefer a customizable solution that is useful beyond the unit tests, see my comment in #530 and PR #536.

[erlend-aasland]

Closed in favour of #536.