packaging: setup: keep and use dwh db credentials

Change-Id: I37a5d82581403e8dbd39fc07f90bd3d7c2510222
Bug-Url: https://bugzilla.redhat.com/1156040
Bug-Url: https://bugzilla.redhat.com/1118322
Signed-off-by: Yedidyah Bar David <didi@redhat.com>