Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Remove __init__ method overriding in HeatContextTestCase"
  - Remove __init__ method overriding in HeatContextTestCase

    Unit test case clases should implement setUp() method instead of overriding
    __init__() method.

    JIRA: YARDSTICK-1210

    Change-Id: I0f9a10575f9aeebf76dfa84619e59589b3ea83f6
    Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 35610d3..0c65859 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 35610d35b6331d561cb0d0382f4cf417aff4469e
+Subproject commit 0c65859939aa1d3758ac5d4862c2d2adeb734983