dpdk: Support of DPDK16.07

dpdk: Support of DPDK16.07

DPDK 16.07 changed the default log level of DPDK enabled applications.
Detection of the end of OVS initialization procedure has been changed
to work for various DPDK versions and for both DPDK and Vanilla OVS.

JIRA: VSPERF-316

Signed-off-by: Martin Klozik <martinx.klozik@intel.com>
Reviewed-by: Maryam Tahhan <maryam.tahhan@intel.com>
Reviewed-by: Al Morton <acmorton@att.com>
Reviewed-by: Christian Trautman <ctrautma@redhat.com>
Reviewed-by: <bmichalo@redhat.com>
Reviewed-by: <sridhar.rao@spirent.com>