Otherwise if some package download fails once - further tries will also
report errors.
Fixesqubesos/qubes-issues#987
(cherry picked from commit f2b5cf1cc0)
This would override user changes to the template. Previous method
(Obsoletes: rpm header) doesn't work now, so add explicit exclude list
as yum option
Fixesqubesos/qubes-issues#996
(cherry picked from commit 4cab815317)
Conflicts:
dom0-updates/qubes-dom0-update
