Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Disable temporarily Doctor from Functest

    The test case is currently failing whatever the scenario/installer

    It is misleading for some scenarios (e.g. barometer)
    As it is systematically failing for the moment, it makes more sense
    to disable the test rather than complexify regex constraints

    The test case will be reenabled when the following points will be fixed:
    - Python 3 support (pending question to Release Manager)
    - packaging OK: pending patches [1] [2] (need merge of [1])
    - remove packet installation in run

    [1] https://gerrit.opnfv.org/gerrit/#/c/38177/
    [2] https://gerrit.opnfv.org/gerrit/#/c/38053/

    Change-Id: Ic06786f0d516f1702dc44dc521ba8ca810ee76f9
    Signed-off-by: Morgan Richomme <morgan.richomme@orange.com>