source: Add name of failing repository
source: Add name of failing repository

Easier to debug.

cgwalters/libhif,Conan-Kudo/libhif,rpm-software-management/libdnf,edynox/libdnf,rpm-software-management/libdnf,Conan-Kudo/libhif,hughsie/libhif,Conan-Kudo/libhif,cgwalters/libhif,kalev/libhif,rpm-software-management/libhif,juhp/libhif,cgwalters/libhif,rpm-software-management/libdnf,juhp/libhif,hughsie/libhif,hughsie/libhif,edynox/libdnf,edynox/libdnf,Conan-Kudo/libhif,edynox/libdnf,rpm-software-management/libhif,cgwalters/libhif,rpm-software-management/libhif,hughsie/libhif,rpm-software-management/libhif,rpm-software-management/libdnf,kalev/libhif