- This change creates a new role to
  support deploying ovs with dpdk.
- This change introduces an enable_ovs_dpdk
  variable to enable ovs with dpdk as part of
  the deploy action.
- This change extends the ovs-dpdkctl.sh tool
  to correctly deploy ovs-dpdk on Ubuntu and CentOS
  hosts.
- This change extends the cleanup-host tool
  to correctly uninstall ovs-dpdkctl.sh tool and its
  systemd files if present on the host.
- This change automatically configures userspace
  kernel drivers.

partial-implementes: bp/ovs-dpdk
Change-Id: I55858d81df437e8258705b75426f61ab9b907c7d