Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Add case_name as constructor arg"
  - Add case_name as constructor arg

    It allows managing multiple TestCase names with only one TestCase
    module. It is mainly required by odl which implements:
      - odl,
      - odl_netvirt,
      - fds.

    It also renames case to case_name in Features to conform with
    TestCases.

    JIRA: FUNCTEST-762

    Change-Id: Ie254f754a0ea3077a8afda1c470528d38c79478f
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>