Wrong parameters on Create Site Job

[Pibotasnus]

Description of the issue

The create site job is specifying wrong parameters for --mariadb-root-username and --mariadb-root-password

Context information (for bug reports)

Steps to reproduce the issue

Observed result

Expected result

Stacktrace / full error message if available

(paste here)

[revant]

Can you send a PR? I'll merge.

--db-root-password, --db-root-username are the new ones.

current ones are for backward compatibility, unless the get deprecated and previous versions are out of support.

[Pibotasnus]

@revant I will do it when I can. It would mean a bit of conditioning in the templating for backward compatibility.