Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Replace assert statements in tests"
  - Replace assert statements in tests

    JIRA: YARDSTICK-966
    Change-Id: Ic98711fa1a31d27fcb60bd96b1b3e22b5cca86b3
    Signed-off-by: Emma Foley <emma.l.foley@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index a6a54f1..e49c338 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit a6a54f115cb55a4cf91df24e9b894f89b232dae8
+Subproject commit e49c33827a359d7c80030cf44efafa65722380c4