Update git submodules

* Update docs/submodules/barometer from branch 'stable/danube'
  - Introducing an external tool for the Barometer mcelog test

    This patch adds the use of mce-inject utility during the mcelog testing.
    It also includes a few (unrelated) flake8 corrections.

    Change-Id: Idd3a7005aad1d1d1f7ae2d3107fbd02c959798c8
    Signed-off-by: Calin Gherghe <calin.gherghe@intel.com>
    (cherry picked from commit 4719824d4b292ba4cf6c36fdb643ae92dfdabc8b)

diff --git a/docs/submodules/barometer b/docs/submodules/barometer
index 6634f2a..1b8b167 160000 (submodule)
--- a/docs/submodules/barometer
+++ b/docs/submodules/barometer
@@ -1 +1 @@
-Subproject commit 6634f2aa7738e94f78735f3a20827fabf3f2c5fa
+Subproject commit 1b8b16741c8fc1bda7b05cc7524fd8bbd258b419