Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'stable/euphrates'
  - Switch from BashFeature to Feature of bgpvpn testcase

    With the adaptation in SDNVPN project [1], Functest
    can run the tests within python instead of a bash call.

    This also fixes pushing the details section to the DB:
    JIRA: SDNVPN-183

    [1] https://gerrit.opnfv.org/gerrit/#/c/45491/

    Change-Id: I7116aa9d5ffe2a816719997771e4f4ecebbcd083
    Signed-off-by: Jose Lausuch <jalausuch@suse.com>
    (cherry picked from commit 3774d9d027c0229c7bec52b247b656a846921369)