shadow: add /etc/default/useradd
The shadow 4.9 stops shiping /etc/default/useradd[1] and uses built-in
settings by default. Some settings are not consistent with previous
shadow 4.8.1 in oe-core. e.g. The default shell is /bin/bash rather than
/bin/sh. Per shadow 4.8.1 settings, add /etc/default/useradd back.
[1] https://github.com/shadow-maint/shadow/commit/
bbf4b79bc49fd1826eb41f6629669ef0b647267b
Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
