Newer version of nss-softokn libraries (> 3.16.2.3) use sysinfo call
so qemu using rbd image hang after start when run in sandbox mode.

To allow using rbd images in sandbox mode we have to whitelist it.

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
Acked-by: Eduardo Otubo <eduardo.otubo@profitbricks.com>