Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Test case spec for SDN controller resilience in non-HA config"
  - Test case spec for SDN controller resilience in non-HA config

    This is the test case specification for verifying the HA capabilities of
    a SDN controller running in a non-HA configuration.

    JIRA: HA-31
    JIRA: YARDSTICK-955

    Change-Id: I10f9ce4a2888092c033d2c02bf9a5a950b8b12dc
    Signed-off-by: Georg Kunz <georg.kunz@ericsson.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index d92c1c8..dc5d121 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit d92c1c8d31c129591f1de8ebb96f0ca0b8b6f51c
+Subproject commit dc5d12165a19371da3d7682b80489c691364ef6f