docs: Update installation guide with DPDK config

Add the additional arguments required for Intel DPDK integration
with Open vSwitch v2.1.2.

Change-Id: Id6c717137119ec6604987e73c0349576d1f466a9
Signed-off-by: Stephen Finucane <stephen.finucane@intel.com>
Reviewed-by: Ciara Loftus <ciara.loftus@intel.com>
Reviewed-by: Kevin Traynor <kevin.traynor@intel.com>
tests: Added Unit Tests for ovdk_flow.c

Change-Id: I5aa80be550c67b89528786d87e35464202fd5156
Signed-off-by: Rory Sexton <rory.sexton@intel.com>
Reviewed-by: Stephen Finucane <stephen.finucane@intel.com>
Reviewed-by: Ian Stokes <ian.stokes@intel.com>
Tests: Added Unit Tests for ovdk_stats.c

Change-Id: I3e3af73cf63e46411d994f28a39ff7b0e2ae2783
Signed-off-by: Rory Sexton <rory.sexton@intel.com>
Reviewed-by: Ciara Loftus <ciara.loftus@intel.com>
Reviewed-by: Meghan Halton <meghan.halton@intel.com>