Update git submodules

Update git submodules

* Update docs/submodules/barometer from branch 'master'
  - Merge "dockerfile: update for OPNFV docker build"
  - dockerfile: update for OPNFV docker build

    The opnfv docker build runs in the docker directory not the barometer directory
    so it doesn't have access to the top level barometer directories that it needs
    to build the barometer image. This commit modifies the Dockerfile to clone the
    barometer repo inside the container image.

    Change-Id: I3518f4a64e806f69b424d24620fb13a9d45e4335
    Signed-off-by: Maryam Tahhan <maryam.tahhan@intel.com>