Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Rewrite usermgmt -- hooking it into the scripting system with dispatch
commands addUser, deleteUser, and editUser. Getting rid of the awkward-
to-use `userinput' bolt-on which Ron and I talked about rewriting.

Rewrite groupmgmt -- hooking it into the scripting system with dispatch
commands groupAdd, groupDelete, and groupEdit. Getting rid of the awkward-
to-use `groupinput' bolt-on which Ron and I talked about rewriting.

Sort messages.

Perform some code consolidation and add some additional error
checking/reporting. (similar to SVN revisions 251919 and 251928)

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.

UI improvements. First, implement --default-item whenever and wherever
possible to save keystrokes. Second, overhaul startup/rcdelete for much
improved performance. Last, but not least, kill-off useage of --clear
and implement --keep-tite in harmony to minimize jarring transitions.
Also, fix local variable names where necessary while we're here with
other minor comment-enhancements/typo-corrections.

Import bsdconfig(8) as a replacement for the post-install abilities of
deprecated sysinstall(8). NOTE: WITH_BSDCONFIG is currently required.

Submitted by: Devin Teske (dteske), Ron McDowell <rcm@fuzzwad.org>
Reviewed by: Ron McDowell <rcm@fuzzwad.org>
Approved by: Ed Maste (emaste)