move accelerator legacy tests

[awaelchli]

What does this PR do?

mv tests/accelerators/legacy/* tests/accelerators/

Follow up on #5743

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[pep8speaks]

Hello @awaelchli! Thanks for updating this PR.

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2021-02-13 19:44:54 UTC

[codecov]

Codecov Report

Merging #5948 (fd43953) into master (0345fcf) will decrease coverage by 40%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master   #5948     +/-   ##
========================================
- Coverage      84%     44%    -40%     
========================================
  Files         184     184             
  Lines       13307   13127    -180     
========================================
- Hits        11138    5765   -5373     
- Misses       2169    7362   +5193