Some review edits to change the useradd-staticids class and the
related USERADD* variables. Input from Paul Eggleton.
(From yocto-docs rev: 9b94046721a971de41d2062a48d624e06dcf17f0)
Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>