Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "updating the traffic profile to enable static cgnapt for ixnet"
  - updating the traffic profile to enable static cgnapt for ixnet

    Change-Id: I49e9c5c69bc997d3ba33387e691459c167f3e4bc
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index a65eb4e..8d37892 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit a65eb4e43179dc4d75d0e2cf158cc73b9ad9a3b8
+Subproject commit 8d378924fb95ccb7375170dead8e356968b6dae5