I do not think there is such plugins and because it asked your help.
A server plugins for the war to make the following things.
When an admin tries to remove the password by a final order amx_rcon sv_password server password reset their absence from his cfg and to give a notice
in chat something that Ganu is allowed to change their password but not out.
And the second thing when you there is no person on the server
it to return to the settings in cfg défaut password and other settings.