Update accelerator connector messages after the addition of strategy

[carmocca]

What does this PR do?

Part of #9932

• Mention the new flags in messages
• Use repr(...) where appropriate (!r)

Does your PR introduce any breaking changes? If yes, please list them.

None

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• [n/a] Did you update the CHANGELOG? (not for typos, docs, test updates, or internal minor changes/refactorings)

PR review

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[codecov]

Codecov Report

Merging #9937 (8edb3b3) into master (16213b1) will decrease coverage by 4%.
The diff coverage is 86%.

@@           Coverage Diff           @@
##           master   #9937    +/-   ##
=======================================
- Coverage      93%     89%    -4%     
=======================================
  Files         179     179            
  Lines       15810   15828    +18     
=======================================
- Hits        14653   14053   -600     
- Misses       1157    1775   +618     

[tchaton]

LGMT !