tests: remove test_multicore_dpif_dpdk_getstats UT

Changes to the dpif_dpdk_get_stats function, made in commit
99636c295b6307d2e2256176ec3cafea0fee8757 (fix dpif_dpdk_get_stats),
have rendered this test obsolete- remove it.

Change-Id: I118483152affb7708595cc06f3e5c0f739338834
Signed-off-by: Mark Kavanagh <mark.b.kavanagh@intel.com>
Reviewed-By: Stephen Finucane <stephen.finucane@intel.com>
Reviewed-By: Mark Gray <mark.d.gray@intel.com>
tests: fix dpif-dpdk-get-stats unit test

Update the dpif-dpdk-get-stats unit test to accomodate changes made
in the dpif_dpdk_get_stats function in commit
99636c295b6307d2e2256176ec3cafea0fee8757 (fix dpif_dpdk_get_stats).

Change-Id: I02004c8875560ff734690dc68861b99e9682e4e2
Signed-off-by: Mark Kavanagh <mark.b.kavanagh@intel.com>
Reviewed-By: Stephen Finucane <stephen.finucane@intel.com>
Reviewed-By: Mark Gray <mark.d.gray@intel.com>
tests: add logging to rte_port_vhost.c

Log a warning when the number of mbufs enqueued to a vhost port
is less than expected.

Change-Id: I48b0a0f74c99ff0b3e7bd050db0a0eb6cece18f0
Signed-off-by: Mark Kavanagh <mark.b.kavanagh@intel.com>
Reviewed-By: Stephen Finucane <stephen.finucane@intel.com>
Reviewed-By: Mark Gray <mark.d.gray@intel.com>