Update git submodules

* Update docs/submodules/barometer from branch 'master'
  - docs: userguide virt plugin instructions

    Change-Id: Ide5acbcccbdf2a151499810d16205f76816601b7
    Signed-off-by: Przemyslaw Szczerbik <przemyslawx.szczerbik@intel.com>

diff --git a/docs/submodules/barometer b/docs/submodules/barometer
index 7116516..b7fc179 160000 (submodule)
--- a/docs/submodules/barometer
+++ b/docs/submodules/barometer
@@ -1 +1 @@
-Subproject commit 711651600397b7eac3d5be2c185a431f48f4b28f
+Subproject commit b7fc179bea3bbb5abafaef11e8bc30170a3a3107