Update git submodules

* Update docs/submodules/barometer from branch 'master'
  - src: add virt plugin configuration

    * adds sample configuration file for virt plugin.
    * updates package list for libvirt package.

    Change-Id: I564fd89f7eaaa170962f5d05bbe26424ab99f6e2
    Signed-off-by: Shobhi <shobhi.jain@intel.com>

diff --git a/docs/submodules/barometer b/docs/submodules/barometer
index abdb29b..7331c92 160000 (submodule)
--- a/docs/submodules/barometer
+++ b/docs/submodules/barometer
@@ -1 +1 @@
-Subproject commit abdb29bfef79c29b2196813cea7b27ed4780bc49
+Subproject commit 7331c926e6f3fdf9d2ad7310be1911c440f6b962