packaging: setup: show note about dwh db credentials

Change-Id: Iac26b56d9c03783c00010fc64beff56ea55666d9
Bug-Url: https://bugzilla.redhat.com/1162549
Signed-off-by: Yedidyah Bar David <didi@redhat.com>
(cherry picked from commit 61d0faafa5d174ec5f4dc619d06f453442a4f13a)