Update git submodules

Update git submodules

* Update docs/submodules/barometer from branch 'master'
  - Merge "src: add OVS PMD stats plugin configuration"
  - src: add OVS PMD stats plugin configuration

    * ovs_pmd_stats: wrapper script to call actual ovs_pmd_stats python script with it's argument.
    * ovs_pmd_stats_config: script to check status of OVS service
    & copy ovs_pmd_stats wrapper script to /usr/local/src/.
    * Updates exec plugin configuration for running ovs pmd stats wrapper script.
    * Updates makefile to include ovs_pmd_stats_config file.

    Change-Id: I78be0bf944e816ab23d30f1c565884a1180724f7
    Signed-off-by: Shobhi <shobhi.jain@intel.com>