request feature(bench mariadb): option_to_require_password_to_execute_bench_mariadb

[foolishdino]

Issue: Feature Request: password for bench mariadb

in cases where some developer are not allowed to access the database, but have the access to maintaining server.
bench mariadb should have the option to require password.
so that in these case the segregation of duty are clearly defined.

Describe the solution you'd like
on executing bench mariadb, it request for a password input