Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Stop redirecting output to json files

    Rally may print additional data to console which results in an
    invalid json files. The json files are generated via rally instead of
    dumping stdout.

    It's mandatory to backport the next bugfix [1] in stable/fraser.

    [1] https://gerrit.opnfv.org/gerrit/#/c/60265/

    Change-Id: Ifbd90e685a7b52c70b3110a46e3c7991eddc05f4
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>