packaging: setup: show note about engine db credentials

Change-Id: Ib38fcc2f24b3994866c3ec0e0c2e3dd8dbca8649
Bug-Url: https://bugzilla.redhat.com/1159789
Signed-off-by: Yedidyah Bar David <didi@redhat.com>
(cherry picked from commit 85f11ae17825f93ee7a60cbeb4c76c1c9029d013)