Results if NDR search is in TPS (so unidir) since
https://gerrit.fd.io/r/c/csit/+/28208
The bug was causing all reconf tests report zero loss,
as they used half of NDR load during reconfiguration.
+ Small improvements to descriptions of other traffic keywords.
Change-Id: Ib9af5861cc09e698eb762feb3f0a019571d17962
Signed-off-by: Vratko Polak <vrpolak@cisco.com>