Update git submodules

* Update docs/submodules/yardstick from branch 'stable/euphrates'
  - Merge "Fixed incorrect Copyright Notice" into stable/euphrates
  - Fixed incorrect Copyright Notice

    Changed Copyright notice on tuples.lua from "Intel Copyright" to Apache 2.0

    Change-Id: I85e6f9eb86c116d552f86cddf05b3b368b32f776
    Signed-off-by: Daniel Martin Buckley <daniel.m.buckley@intel.com>
    (cherry picked from commit 204702db384241faffbf0848ad0bc63fa476b52d)

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index ed13032..f9eadce 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit ed130329d8eda6f2143ffd35c2fe2209186e5d64
+Subproject commit f9eadced5bdd726b4977738c634a26eef053dd2f