packaging: setup: align user instruction for database creation

'create user' -> 'create role'

Also:

'engine_history' -> 'engine_reports'

Change-Id: I60499d3485178bcf26372d5b332f0389dc9de57e
Related-To: https://bugzilla.redhat.com/1040572
Signed-off-by: Yedidyah Bar David <didi@redhat.com>