Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "the recovery action of "baremetal down" should be triggered mandatory"
  - the recovery action of "baremetal down" should be triggered mandatory

    YARDSTICK-1222 has made attacker recover only when the sla not pass.
    But for baremetal down test case, the node need to power on even the sla pass.

    TODO:
    Make attacker can support mandatory recover in some situation.

    JIRA: YARDSTICK-1337

    Change-Id: Ib567b9b9025e5ee421ea47140c468537ad16f090
    Signed-off-by: rexlee8776 <limingjiang@huawei.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 4343c22..06d2c38 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 4343c22ed72556aca12aea1167b7b92e02e8a20d
+Subproject commit 06d2c38dfd22956a7f60535eb5b59d6fb94098ff