Update git submodules

* Update docs/submodules/barometer from branch 'stable/danube'
  - config guide: Add MIBs location for OVS events plugin

    Change-Id: I14638386cdf7aee3f3e344a2c0e27a6edceaf874
    Signed-off-by: Mytnyk, VolodymyrX <volodymyrx.mytnyk@intel.com>

diff --git a/docs/submodules/barometer b/docs/submodules/barometer
index 1b8b167..a238e8a 160000 (submodule)
--- a/docs/submodules/barometer
+++ b/docs/submodules/barometer
@@ -1 +1 @@
-Subproject commit 1b8b16741c8fc1bda7b05cc7524fd8bbd258b419
+Subproject commit a238e8a0ea87790bb38c2dc040adb9dbb80b5bec