Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Add ODL HA testcase"
  - Add ODL HA testcase

    This testcase confirms the resiliency of Opendaylight
    in a HA deployment

    SPEC: https://gerrit.opnfv.org/gerrit/#/c/50991

    JIRA: HA-33
    JIRA: YARSTICK-955

    Change-Id: I4cb39d1970ed0333a43fbb58f8c7138908379dcb
    Signed-off-by: Dimitrios Markou <mardim@intracom-telecom.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 41fb1bc..c47c33e 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 41fb1bcb3ef34137e48ff9755cc82f2fc5fe9074
+Subproject commit c47c33e6071a14485929bb58ee6e1d2aaeff7243