Issue 49028 - Add autotuning test suite
Description: Add test suite for the autotune cache sizes by default feature
and for the autotune threads at startup feature.
https://pagure.io/389-ds-base/issue/49021https://pagure.io/389-ds-base/issue/49028
Reviewed by: mreynolds, wibrown (Thank you, guys!)
(cherry picked from commit 4d457b5917330b1bd8f955f63c61a9dcfb243ee1)