engine: Fixing NPE in CollectVdsNetworkDataVDSCommand

The NPE is occuring because of some changes in Base class.
As a fix, start to pass a VDS as parameter and not vdsId

Change-Id: I9d3027b134e11e9fb22cd007d10ce4b9fd8afbb6
Signed-off-by: Michael Kublin <mkublin@redhat.com>