Update git submodules

* Update docs/submodules/yardstick from branch 'stable/gambia'
  - Merge "Make OvS max_idle & queues configuration optional" into stable/gambia
  - Make OvS max_idle & queues configuration optional

    Remove hardcoded rx queue value

    JIRA: YARDSTICK-1493

    Change-Id: Ia4944db21d94399c724bcabf4e0eae809518e7e9
    Signed-off-by: Mytnyk, Volodymyr <volodymyrx.mytnyk@intel.com>
    (cherry picked from commit 68c127e17028e9961abcbd1c9a72fe2b878c427b)

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index f325b13..60ef7ff 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit f325b13d7317a64b22591670dd765a6fb0c4d8a8
+Subproject commit 60ef7ff374c60a0525cbb8128560b0c3ce2397c7