scripts/vagrant: add gdisk and sysstat packages

The sgdisk and sar utilities are missing in the Ubuntu puppet box.
I had to add sgdisk to my Vagrant dev box when I tried to demonstrate
the SPDK nbd app on my laptop. I also had to add the sysstat utility to
use sar. Both sgdisk and sar were already installed on bare metal.

Change-Id: I1e5d2d1e61a45d9520e2eaf196366009f16ad0fb
Signed-off-by: John Kariuki <John.K.Kariuki@intel.com>
Reviewed-on: https://review.gerrithub.io/401951


Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Seth Howell <seth.howell5141@gmail.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>