Update git submodules

* Update docs/submodules/openretriever from branch 'master'
  - Merge "Add yardstick example"
  - Add yardstick example

    Change-Id: I7c0d4a8d7957ee5eb0efd39e75c561102fa9e06a
    Signed-off-by: Guo Ruijing <ruijing.guo@intel.com>

diff --git a/docs/submodules/openretriever b/docs/submodules/openretriever
index 5e53d80..edea600 160000 (submodule)
--- a/docs/submodules/openretriever
+++ b/docs/submodules/openretriever
@@ -1 +1 @@
-Subproject commit 5e53d80ca4d3fbcf095b4e02d36b4e28fd7af00f
+Subproject commit edea600a65fa5879c564c2f8de3bbbf1d91f7823