packaging: setup: avoid asking about engine configuration during upgrade

Avoid asking about engine configuation during an upgrade
from 3.4. engine-setup 3.4 didn't allow to skip the engine
configuration and we didn't support partial upgrades so,
if it's there, we need to upgrade the engine too.

Change-Id: Ibf0f6ac38c748e332336ddc1c05ec7d8b4df6014
Signed-off-by: Simone Tiraboschi <stirabos@redhat.com>