Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Fix PROX throughput result calculation"
  - Fix PROX throughput result calculation

    The success criteria needed a fix for throughput
    calculation. The results on success criteria were
    muliplied by 1000*1000 which is not correct and
    not needed as this was leading to false results
    in grafana.

    JIRA: YARDSTICK-1172

    Change-Id: I56b24a700f8a565db80897aeab796e7039cae5c9
    Signed-off-by: Abhijit Sinha <abhijit.sinha@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 29a75d1..ebeb81e 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 29a75d1c182b6a707c36fbc48a3e4b123f390d9f
+Subproject commit ebeb81ea222770e2f5330b680a8a13f587e023e8