webadmin: Added "status" to the "Virtual Machine" entity object.

Added the "status" property to the "Virtual Machine" entity object to be
used by the fix for the ui plugin ovirt-optimizer.

Change-Id: I5801fe4bd1dffb3d39d122db6e66deb5c7cee385
Bug-Url: https://bugzilla.redhat.com/1140723
Signed-off-by: Tomer Saban <tsaban@redhat.com>