virt: move redir device to vmdevices.py

No real code changes

Change-Id: I0c79e501008edeb6def6b78b1416882001276030
Signed-off-by: Martin Polednik <mpolednik@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/32608
Reviewed-by: Antoni Segura Puimedon <asegurap@redhat.com>
Reviewed-by: Francesco Romani <fromani@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>