Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "delete obsoleted zte pod info"
  - delete obsoleted zte pod info

    Delete zte pod info in yardstick/etc/yardstick/nodes.

    Change-Id: Ie22fd9fa4b84529f0b2a7d113776d3559106e67a
    Signed-off-by: zhihui wu <wu.zhihui1@zte.com.cn>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 675a359..5852f3b 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 675a359a26ec4a659e35bb124484d19e12765ac3
+Subproject commit 5852f3bc0cc792ace83ea1eb69141586670051ea