Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Allow running unittest.TestCase via run_tests.py"
  - Allow running unittest.TestCase via run_tests.py

    pytest_suite_runner can run any unittest.TestCase thanks to name passed
    as run arg. Here is the related functest/ci/testcases.yaml:

      run:
          module: 'functest.core.pytest_suite_runner'
          class: 'PyTestSuiteRunner'
          args:
              name: 'functest.tests.unit.odl.test_odl'

    Change-Id: I7c2c611c4afbad1e52bfdca4a3288ccc21491389
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>