Added the environment variable "root_password_expired" to
control if the initial, temporary, root password is initially
set up as "expired".  If set to "yes" (default), the root password
is set as "expired" and the user must change it at first login.
Signed-off-by: Michael H. Warfield <mhw@WittsEnd.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>