Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Fix parsing of the results from collectd plugins

    Change-Id: I3f7b9ca17164564b11517116e7e73b47f42243b9
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 126450b..5d3d294 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 126450b753244c089dbae8f3f10a4a141d65cf57
+Subproject commit 5d3d2945171bd317a9bdf252e4c668b965412c32