No need to add packages to IMAGE_INIT_LIST. Use pkgpriorities.
See also commit 8551e710

It shouldn't be overridden but rather appended to;
the leading "+" is ensured by lib/profile.mk
(see also mkimage's README for details).

A brown paper bag class bug :-(

This has been factored out from distro/alt-workstation
adaptation for e2k arch (as it looks more widely useful).