cli: construct object using factory on update, rather than fetching live instance
cli: construct object using factory on update, rather than fetching live instance

Construct object using factory and set parameters to it
instead of fetching it from server and updating it.

Change-Id: I34a910a7f1ecae5385e2a6dcd2297a65f419bc9c
Bug-Url: https://bugzilla.redhat.com/950684
Signed-off-by: Ravi Nori <bf47ec8a2baaf65311c5a064c9beebccfad435d6@redhat.com>

oVirt/ovirt-engine-cli,oVirt/ovirt-engine-cli