Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Tox utility to run unit tests"
  - Tox utility to run unit tests

    Now run_unit_tests.sh only calls tox to allow merging.
    It can be safely deleted as soon as the related jjob is updated.

    It also removes test_logging.ini.

    Co-Authored-By: Cédric Ollivier <cedric.ollivier@orange.com>
    Change-Id: I934f4ac739d99d0cb29bea8c6aac6d6780b30901
    Signed-off-by: ashishk1994 <ashishk.iiit@gmail.com>
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>