Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Re-enable orchestra tests (VNF)"
  - Re-enable orchestra tests (VNF)

    "Marketplace is now running on port 8080. In addition, we have extended the
    marketplace backend in order to return the last modified header so that images
    are not re-downloaded all the time tests are executed. It should be done by
    Monday EOB" [1]

    [1]: https://jira.opnfv.org/browse/ORCHESTRA-17?jql=project%20%3D%20ORCHESTRA

    JIRA: ORCHESTRA-17

    Change-Id: I17f6316003be9c2c3131ed640e6a32e482d1a174
    Signed-off-by: Morgan Richomme <morgan.richomme@orange.com>