[OE-core] [Draft design][RFC] Running postinst at rootfs generation time

[Hauser, Wolfgang (external)]

Beside the discussed changes, the postinst scripts should be executed in
the dependency order.
At the time, the scripts are executed in alphabetic order, which breaks
the image generation if depended packages are not in alphabetic order.

e.g. busybox and busybox subpackages (busybox-mdev).

Regards
Wolfgang Hauser