SRIOV + DPDK grub settings
SRIOV + DPDK grub settings

The existing SRIOV linux setting of intel_iommu=on is not sufficient if
the system has DPDK enabled. To make it work along with DPDK we need to
enable iommu in passthrough mode.

This provisoning script enables the second option as well in ubuntu
grub.

Change-Id: Ie9d32b5cf79e011725890dd143f75e9d78c5ffda
partial-bug: #1544411

Juniper/contrail-provisioning,Juniper/contrail-provisioning