Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Add upper-constraints.txt for Functest"
  - Add upper-constraints.txt for Functest

    It completes OpenStack's upper-constraints.txt by adding Functest's
    requirements.

    This file is temporarily duplicated to allow building the containers.
    It will be removed via a next patch when this patch is merged.

    openbaton-cli could be updated (e.g. 3.2.8).

    Change-Id: I26de2d22f9e8973c5a58c3cc5129142fa628e57a
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>