packaging: setup: update DB configuration reading

This new implementation requires engine and dwh
to be run and set up correctly before reports
package can be setup. In case engine's or dwh
settings are not found, the setup will exit
with the corresponding message.

Also it updates DB conf to be defined in a spec file.

Change-Id: I430eee10a06fabeab24c9f4f240373a7b830878a
Bug-Url: https://bugzilla.redhat.com/1026089
Signed-off-by: Alex Lourie <alourie@redhat.com>