Add new testcase for LTD.Scalability.RFC2544.0PacketLoss

Add new testcase for LTD.Scalability.RFC2544.0PacketLoss

This test adds a multistream config item,
taking the required number of flows to setup in the traffic,
to the existing testcase and then running the standard
2544 Throughput test. The config is plumbed through
from the 01_testcase.conf via ITraffic to the IxNet.
01_testcase.conf contains new parameter MultiStream
for 2544 Throughput test.

JIRA: VSPERF-19

Change-Id: I12e0e76a5f54dc13b854f3a65f3a4a0fe90ff885
Signed-off-by: Radek Zetik <radekx.zetik@intel.com>
Signed-off-by: Martin Klozik <martinx.klozik@intel.com>
Reviewed-by: Billy O Mahony <billy.o.mahony@intel.com>
Reviewed-by: Eugene Snider <Eugene.Snider@huawei.com>
Reviewed-by: Gurpreet Singh <gurpreet.singh@spirent.com>
Reviewed-by: Tv Rao <tv.rao@freescale.com>