Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Fix pylint warnings in test_odl

    It takes into account the following warnings:
      - wrong-import-order
      - bad-continuation
      - unused-argument
      - invalid-name
      - too-many-arguments

    missing-docstring is partially disabled as they are unit tests.

    It has been rated at 10.00/10.

    Change-Id: I35886ec75a9e66817cfd0fe18534f157d7500a2b
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>