angstrom core tweaks: add 'package-management' to EXTRA_IMAGE_FEATURES if unset
angstrom core tweaks: add 'package-management' to EXTRA_IMAGE_FEATURES if unset

It turns out package management only worked due to a bug in rootfs_ipk.bbclass. With that bug fixed we suddenly loose all packagemanagement data :(

Signed-off-by: Koen Kooi <42e3d96910f922bdd7dd1805fe3f8aff634f391d@dominion.thruhere.net>

kraj/meta-angstrom,kraj/meta-angstrom,Angstrom-distribution/meta-angstrom,schnitzeltony/meta-angstrom,Angstrom-distribution/meta-angstrom,pompomJuice/meta-angstrom,pompomJuice/meta-angstrom,martiert/meta-atto,pompomJuice/meta-angstrom,Angstrom-distribution/meta-angstrom,schnitzeltony/meta-angstrom,kraj/meta-angstrom,martiert/meta-atto,martiert/meta-atto,martiert/meta-atto,schnitzeltony/meta-angstrom,Angstrom-distribution/meta-angstrom