packaging: setup: enforce VM name

Enforce VM name to HostedEngine allowing the engine
to rely on the VM name for identifying the VM running
the hosted engine.

Change-Id: Ia240da36d180db8612b9fbd5d31676c25dee69a4
Related-To: http://gerrit.ovirt.org/18783
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>