packaging: rename engine-reports.conf.d to ovirt-engine-reports.conf.d

Also renamed dwh configuration directory to match current.

Change-Id: Ib25cf566c9b3759ffac32ecc744c5fc547a7f677
Bug-Url: https://bugzilla.redhat.com/1043957
Signed-off-by: Yaniv Dary <ydary@redhat.com>