datapath: Add comments to ovdk_main.c

Change-Id: Ifc7546621cd30f096da9cd447d58311ae0cce70c
Signed-off-by: Stephen Finucane <stephen.finucane@intel.com>
Reviewed-by: Mark D. Gray <mark.d.gray@intel.com>
guest: update ovs_client logging

'ovs_client' currently uses 'printf' as its logging mechanism.
Replace this with RTE_LOG, to remain consistent with other DPDK userspace
applications.

Additionally, expand logging to report potential issues:
- when 'tx' mbufs cannot be successfully enqueued to the IVSHM port's rx ring
- when 'alloc' mbufs cannot be successfully enqueued to the IVSHM port's free
  ring

Signed-off-by: Mark Kavanagh <mark.b.kavanagh@intel.com>

Reviewed-By: Mark Gray <mark.d.gray@intel.com>
Reviewed-By: Stephen Finucane <stephen.finucane@intel.com>
Change-Id: Ib8015129dc71b717995157118a29a0f19fead44d
datapath: Add initialize/shutdown functions

Add initialize/cleanup routines for the master lcore. These routines
do not currently do anything new. However, they will be useful for a
number of cleanup tasks.

Change-Id: I13aab6526038987bd2346e6e570505e6565c91dc
Signed-off-by: Stephen Finucane <stephen.finucane@intel.com>
Reviewed-by: Mark D. Gray <mark.d.gray@intel.com>
Reviewed-by: Mark B. Kavanagh <mark.b.kavanagh@intel.com>
datapath: Reformat some files

Reformat 'ovdk_vhost-net-cdev.*' per standards.

Change-Id: If870bf06fcef9a14e85fe741ad57373d1dda24e8
Signed-off-by: Stephen Finucane <stephen.finucane@intel.com>
Reviewed-by: Mark D. Gray <mark.d.gray@intel.com>
Reviewed-by: Ian Stokes <ian.stokes@intel.com>