Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'stable/fraser'
  - Generate API doc rst files

    It also fixes few docstrings

    Change-Id: I09b3456e82953f64ec49628e2979115cc7bbec55
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
  - Publish Functest doc online

    It reverts Sphinx theme to the default one as it's hugely better for
    API docs.

    Change-Id: Ic489e9b65d67d71fadb8ef78176a04cc382a3f5d
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
    (cherry picked from commit 20ee61db8d38bf12127afd12e34ac601d36b3ff5)