Details

This PR removes the need to store the current database charset in the params file, instead detecting it only at runtime and saving it in memory during the operation of checksetup.pl. The params are instead remapped to the detected value if appropriate.

Additional info

• bug#1917423

Test Plan

1. Created a new database from scratch with a clean checkout of this branch, and went through the installation procedure. Installation completed without error, the complaint about the data directory missing is gone.
2. Manually tweaked some table charsets to trigger the charset conversion code, ran checksetup.pl again, and ensured that charset conversion happened correctly.