packaging: setup: use db creds from answer file

Change-Id: Icac431a840c1207313c5a4b6e47eace93d1dd099
Bug-Url: https://bugzilla.redhat.com/1100281
Signed-off-by: Yedidyah Bar David <didi@redhat.com>
(cherry picked from commit 03e30bbb24abbe246b800696e5c75a78f89f5f89)