Would like the ability to easily configure password parameters for admin users
(similar to what we can do for frontend users via FEU).

- specify minimum/maximum length
- allow alphanumeric only or also special chars
- disallow passwords that are similar to previous passwords (i.e. password01,
password02, etc.)

As a related request, add the ability to lock out a specific username after a
specified number of failed logins.  Could lock out permanently (until
re-authorized by another admin user) or for a specified time interval.

Thanks!!