Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Clean run_tests.py and the related ut"
  - Clean run_tests.py and the related ut

    It enhances run_tests.py as proposed in [1].
    It also prints all skipped tests in summary and fixes copyright
    headers. All the related unit tests have been updated too.

    [1] https://jira.opnfv.org/browse/FUNCTEST-832

    JIRA: FUNCTEST-832
    Change-Id: I59b96422bc7942ecd6270c45ab7a3fb603c13ccb
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>