Fixes after pre-commit-config updates

Marco Clemencicrequested to merge
fixes-after-pre-commit-updates into master

This fixes a few tests that were affected by !4884 (merged)

  • test_tonic: it checks for a specific line that has moved with the reformatting
  • diffopts_git and diffopts_ndiff: the end-of-file-fixer pre-commit checker removed a required empty line at the end of the reference files
  • make DDDB.Configuration robust against reordering of imports (an alternative to !4886 (merged))

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