Expand link for source_version
Expand link for source_version

direct_http needs expansion in order to get source version
from linked modified _product

https://lists.opensuse.org/opensuse-buildservice/2016-03/msg00080.html

Signed-off-by: Dinar Valeev <5117617bf147dfe0d669bc60877f607cdec8696e@suse.com>

openSUSE-Team/obs_factory,openSUSE-Team/obs_factory,openSUSE-Team/obs_factory