Do it as part of %post instead of waiting until boot.
There are several advantages to this approach: it makes boot
a little bit faster, and prevents a warning about sysvinit
compatibility being deprecated from being printed.
Most importantly, if the user decides to change the password
after installation, that change will now stick instead of
being reverted every time the machine is booted.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
(cherry picked from commit 2e51a65e040ac1caf556d0f87e3facea407ca301)
40b7729123