Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Add a missing colon in the sample config

    Just in case anyone uses this file for testing.

    Change-Id: Iff0489f839f3985e43ac31d2a89147e5f16c59e9
    Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 93b96e3..02854cd 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 93b96e3aed1a56d8910f7d09e556ff720d261fb2
+Subproject commit 02854cdde659f67775f1c2f37932fb4e7689840a