When building not for ISO_LIVEUSB, the sources are not downloaded.
Liveusb build is broken anyway, but the upstream mirror is gone.
(cherry picked from commit 7b424ec65f)
This reverts commit 416e3eb0c5.
This shouldn't be needed, when lorax will be called as a separate
process, not imported into pungi as a module (where python version
matters).
Fedora 23 forces every app that can be run under python 3 to be installed
as a python 3 app. This means lorax is installed as python 3 while pungi
remains 2.7. As soon as pungi is updated to python 3 (or the Fedora team
come to their senses) this package can be deleted.
