Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Enforce a versioned public identity endpoint"
  - Enforce a versioned public identity endpoint

    juju simply adds /auth/tokens to the public identity endpoint wich
    fails vs an unversioned endpoint as currently advised. It enforces
    a versioned endpoint till juju implements the right discovery.

    It may be improved to detect the right API version instead of forcing
    v3. But v2 is hugely deprecated and no longer used by all OPNFV
    installers.

    It also fixes errors/warnings listed by pylint.

    Change-Id: I6e8ba4b2122c19629426530d2d34e51e1bc609ba
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>