[configs/releng] Generate list of packages.
* For installed packages on live-enviroment use mkarchiso pkglist command. * For packages in [core] repo in core.iso, make a list of them during repo generation. It uses the same format like done by pkglist command: <repo>/<package>-<version> (anyway repo is always core in this case). Signed-off-by: Gerardo Exequiel Pozzi <email@example.com>