Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Collectd"
  - Collectd

    Change-Id: I15e4ac38b347a08350b71c68469e2793eeed92ab
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>
    Signed-off-by: Edward MacGillivray <edward.s.macgillivray@intel.com>
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 2ad9609..ca0aaae 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 2ad96094b99e007f5ef46aced3b69a9ced558da3
+Subproject commit ca0aaae662da454451e1efdbef2cd3f779f7c093