Fix generate_(doc_)package_installed, passing multiple values was borked.
Fix generate_(doc_)package_installed, passing multiple values was borked.

gdm/gentoo-bb,edannenberg/gentoo-bb,guruvan/gentoo-bb,guruvan/gentoo-bb,gdm/gentoo-bb,jonasjonas/gentoo-bb,edannenberg/kubler,berney/gentoo-bb,berney/gentoo-bb,jonasjonas/gentoo-bb,edannenberg/gentoo-bb