Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Adding three missing test case descriptions"
  - Adding three missing test case descriptions

    HA tests TC056, TC057 and TC058 are missing from Yardstick
    test case list. Missing white space added to tc056.rst.

    Change-Id: Id56a22ad96af8c3d05d95fb58259e9683ce9fab0
    Signed-off-by: Mika Rautakumpu <mika.rautakumpu@nokia.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index e5775e7..93b96e3 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit e5775e7efbc55f116b4d4ac11ff87b8d8553247e
+Subproject commit 93b96e3aed1a56d8910f7d09e556ff720d261fb2