packaging: setup: do not allow setup to continue if there is an upgrade

if setup is newer than installed packages (x.(y-n).z, x.y.(z-n)), the
setup is incompatible of installing the previous version.

abort the process to avoid damage.

Change-Id: I84dc383696cf3d3b85d0f64b84896113f4fe91b5
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>