IXIA setup: Fix to create packets with the specified values.

IXIA setup: Fix to create packets with the specified values.

This patch fixes the setting of the packet fields generated by IXIA.
So that  packets will be created with the values we pass, eg UDP
source port, UDP dest port, MAC source address.

JIRA: VSPERF-477

Change-Id: I15371b9f4e5fe60f738fc0e836ec7abc4f2a3938
Signed-off-by: Antonio Fischetti <antonio.fischetti@intel.com>
Reviewed-by: Maryam Tahhan <maryam.tahhan@intel.com>
Reviewed-by: Martin Klozik martinx.klozik@intel.com
Reviewed-by: Al Morton <acmorton@att.com>
Reviewed-by: Christian Trautman <ctrautma@redhat.com>