ixia: Bugfixing and burst type enhancement

ixia: Bugfixing and burst type enhancement

A support for proper reporting of "Burst" traffic type was added.
Several bugs were fixed:
* RFC2544 Throughput - end of search condition was moved to avoid
  situation, that another iteration is executed but its results
  dropped
* RFC2544 Throughput - pause after each iteration was added to ensure
  that all frames are cleared from buffers; It improves stability
  of results. Also "received" values are no longer higher then
  "sent" values.
* VSPERF will report also the number of sent and received frames
* VSPERF will correctly process send and received values - they
  were switched on several places

JIRA: VSPERF-149
JIRA: VSPERF-562

Change-Id: I8a5caa6385a1ef86aa4bf4511d2753100ed0ab14
Signed-off-by: Martin Klozik <martinx.klozik@intel.com>
Reviewed-by: Al Morton <acmorton@att.com>
Reviewed-by: Christian Trautman <ctrautma@redhat.com>
Reviewed-by: Sridhar Rao <sridhar.rao@spirent.com>
Reviewed-by: Richard Elias <richardx.elias@intel.com>