Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Add OvS 2.8.1 support into SA context"
  - Add OvS 2.8.1 support into SA context

    JIRA: YARDSTICK-1462

    Change-Id: I001a173fc728be6e88f5ae6d38c64b740e536ff2
    Signed-off-by: Mytnyk, Volodymyr <volodymyrx.mytnyk@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index ae1e33a..111b92a 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit ae1e33ac7cfbad4b9a37329152ac4a42903a44d5
+Subproject commit 111b92a6a9d9ca9c24442497e444770369fac8be