* Update docs/submodules/yardstick from branch 'master'
- Merge "Added external versions for vFW and cgnat TCs."
- Added external versions for vFW and cgnat TCs.
Change-Id: I6778dac0c60f090238ed1f4860470e62a64c7d69 Signed-off-by: Maciej Skrocki <maciej.skrocki@intel.com>