Curb another regression (this one introduced by r251545, itself trying to
fix the regression introduced by r251544; which was trying to make things
consistent w/respect to ESC versus YES versus NO in the password disable
prompt in "Login Management".

(need stronger coffee; very sorry for the churn)

With this revision, the "YES", "NO", and implied ESC options all work as-
expected. Choosing "YES" allows you to proceed and the password will be
disabled. Choosing "NO" will bring back around to enter a password for the
account. Pressing ESC will drop you out of either user or group input and
back to the usermgmt screen.
Minor markup.
Add a prompt to the "Add User" and "Add Group" sub-menu items (under the
"Login Management" module): Use default values for all account details?

If you select "Yes" (the default is "No"), you'll jump past all the prompts
and jump straight to the review screen with all-default values.

Makes adding a lot of users/groups faster/easier if you don't need to
customize more than one or two different values from their defaults.