lb config option "--initsystem sysvinit" have no effect

[Martinx - ジェームズ]

Hey guys!

I'm using Jessie with `sysvinit-core`, and I need to build a Debian Live CD
using the following command:

lb config -b iso --bootloader grub --initsystem sysvinit
sudo lb build

But then, the ISO image was built using `systemd-sysv` as my init, instead
of `sysvinit-core`.

What am I missing?!

Thanks!
Thiago