nestedvt hook: identify kvm_amd properly

kvm_amd uses "1" for it's nested flag, kvm_intel uses "Y"

Change-Id: I5bdad306f3f195e5f369d095c3cd2ec63eaba169
Bug-Url: https://bugzilla.redhat.com/1035314
Signed-off-by: Sander <bugzilla@grendelman.com>
Signed-off-by: Dan Kenigsberg <danken@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/23164
Reviewed-by: Francesco Romani <fromani@redhat.com>
Reviewed-by: Michal Skrivanek <michal.skrivanek@redhat.com>
Tested-by: Michal Skrivanek <michal.skrivanek@redhat.com>