Update git submodules

Update git submodules

* Update docs/submodules/compass4nfv from branch 'master'
  - Merge "Update Barometer plugin to use collectd container"
  - Update Barometer plugin to use collectd container

    Modifies/updates the following to use a barometer container
    from dockerhub for collectd.

    /plugins/barometer/roles/collectd/tasks
    /pluigns/barometer/roles/collectd/templates
    /plugins/barometer/roles/collectd/vars
    /plugins/barometer/roles/collectd/files

    Change-Id: I627afd8fef12c4aa3ff5ac54a55d00f9567406f2
    Signed-off-by: ramamani yeleswarapu <ramamani.yeleswarapu@intel.com>