packaging: setup: fixed cpu validation

- removed unused constant AIO_VDSM_CAPS_MODULE.
- added check on virtualization hardware / bios support
- avoid to enable AIO plugin if the host doesn't
  support virtualization

Change-Id: I9c19c1d6bf80c0d5f54105f785d97ba7b203cccc
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>