Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Catch os.makedirs() exceptions in tempest.py

    It can raise an error exception if the leaf directory already exists or
    cannot be created [1].

    [1] https://docs.python.org/2/library/os.html

    JIRA: FUNCTEST-804

    Change-Id: Ie410bccf1bb2dfd36df6e918c152ecf94844b5d7
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>