Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "test_monitor_command: mock LOG so we don't output error"
  - test_monitor_command: mock LOG so we don't output error

    Don't print fake tracebacks to the unittest logs

    Change-Id: I8a468b8c6566f02be88a9dd222567c14c66b0956
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 4b47f13..80e57bf 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 4b47f130f31dc7a82e3dfa842acc169cd5d05a07
+Subproject commit 80e57bf2264577cb08c2c347c7f0d272ee8d192f