Update git submodules

* Update docs/submodules/yardstick from branch 'stable/gambia'
  - Merge "Allow to see steady state status in the yardstick logs" into stable/gambia
  - Allow to see steady state status in the yardstick logs

    Change-Id: Ic2281b300ed1de6ecd3daf14b5273db22688de8d
    JIRA: YARDSTICK-1454
    Signed-off-by: Ameed Ashour <Ameed.Ashour.Ext@nokia.com>
    (cherry picked from commit ad08f101fa3a23e9a35fa9ba3e28dd22a054ef52)

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index ec17200..f325b13 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit ec172003f44c60fcc2cb16d669815a3b134bb113
+Subproject commit f325b13d7317a64b22591670dd765a6fb0c4d8a8