sdk: create resouce only if not exist
sdk: create resouce only if not exist

Change-Id: I3d8309f9e942380a358358b4cabbc8d01bc8cfd0
Signed-off-by: Michael pasternak <af5566a40fc9757136fd9da9ca5e2dbdd9b039eb@redhat.com>

oVirt/ovirt-engine-sdk-tests