Update git submodules

* Update docs/submodules/yardstick from branch 'stable/gambia'
  - Merge "Add Testcase for Prox Standalone OvS-DPDK." into stable/gambia
  - Add Testcase for Prox Standalone OvS-DPDK.

    No sample testcase for prox OvS-DPDK standalone.

    JIRA: YARDSTICK-1475

    Change-Id: Ide65444d08d6c90e7e98d59b7d1f4cba8ca7397f
    Signed-off-by: Carey, Alan <alan.carey@intel.com>
    (cherry picked from commit b0e92a357658f4ece21e356653e8eb52d7ab8d98)

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index fca226f..f7cb01d 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit fca226f700f7c3888b4665bc7023744cd3285e68
+Subproject commit f7cb01d9e1e32b018a87f4e5226b65fcc6baa615