engine: Host life cycle improvement - InitVdsOnUp

InitVdsOnUp is called from VdsManager.OnTimer, vds object can be passed directly
we don't need to pass id and after that retrieve an object again from DB.
Less queries we use - much faster we run.

Change-Id: I4b3e883dd365d9f036a1103a44b771e14116bcbf
Signed-off-by: Michael Kublin <mkublin@redhat.com>