Remove legacy client config attrs

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.86%. Comparing base (44ff0c1) to head (8ff5a37). Report is 4 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #664 +/- ## ======================================= Coverage 88.85% 88.86% ======================================= Files 42 42 Lines 4829 4814 -15 ======================================= - Hits 4291 4278 -13 + Misses 538 536 -2 ```

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