engine: Update spec openstack SDK to 3.0.4

Network creation code updated to use the non-deprecated entities.

Change-Id: I4bd7373006a996fd1bb6c9efc5927fabcada81e3
Related-To: https://bugzilla.redhat.com/1064749
Signed-off-by: Mike Kolesnik <mkolesni@redhat.com>