Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Add context name to Dummy test"
  - Add context name to Dummy test

    Since I1447fb5ed447691eaeb0a97f928c0b3333799d07, the context name is
    a mandatory parameter for every context.

    JIRA: YARDSTICK-886

    Change-Id: I0ccb7e9fabdf6bc2890d2e4763f53baee06c87b2
    Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index e42e6b7..b367a8e 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit e42e6b7ae99590c9590d1d4c9dfffe90e2677977
+Subproject commit b367a8efbd894fb9b9f7eb084a002644be41998d