sos: engine: collect full service configuration

Collect also /var/tmp/ovirt-engine/config content.

Change-Id: Id41c3859731a77cb2c771d327730c277b81a8c54
Bug-Url: https://bugzilla.redhat.com/1035825
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>
(cherry picked from commit 4f09866ebf9afd3462d02a0e1d349093bae592b9)