Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Introduced timeout to post method of HttpClient"
  - Introduced timeout to post method of HttpClient

    We seen cases where grafana container bring-up code would fail,
    because of too quick access to the http api. Added 10sec timeout
    for the first query of the API.

    Change-Id: Ifc95a626d0ab5552a1f26fb167fc3f65791392d7
    Signed-off-by: Maciej Skrocki <maciej.skrocki@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 173c6ad..36a2e04 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 173c6ad6f464c514185efc0b5a608ceb6cc118ae
+Subproject commit 36a2e04b468d980c98bd43768e4c88d37a8a69f1