Update git submodules
* Update docs/submodules/yardstick from branch 'master'
- Merge "NSB TREX RFC2544 scenario fails with correlated traffic"
- NSB TREX RFC2544 scenario fails with correlated traffic
When correlated traffic TC is running, the traffic is
running only on uplink ports instead of both type of ports
(yardstick/network_services/traffic_profile/rfc2544.py +113).
Trex TG fails to get samples on downlink ports.
JIRA: YARDSTICK-1357
Change-Id: I66d78b73f2dc5bb531fe8607d0e46f60b828953e
Signed-off-by: Mytnyk, Volodymyr <volodymyrx.mytnyk@intel.com>