Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Modify how to disable logging in unit test."
  - Modify how to disable logging in unit test.

    Logs are only disabled when the unit tests are run from cmdline.
    It allows running them via pytest_suite_runner.py and printing
    their results to functest.log.

    You should notice that the unit test must disable the logger of the
    tested TestCase (e.g. testcase.TestCase.logger.disabled = 1). Otherwise
    false logs will be printed in console.

    Change-Id: Ic171e4575c8bab2e52db1897ae026b61a03b6247
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>