Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Fixes image download script"
  - Fixes image download script

    Fixes Include:
     - Fix previous behavior where multiple copies of the same file would be
       downloaded as blah.qcow.1, blah.qcow.2 and not overwrite original
       file.
     - Fix issue where files were always downloaded, even when they were not
       different from server version.

    It temporarily stops downloading from marketplace.openbaton.org:8082
    which is blocked by LF firewalls.
    wget options are tuned to avoid wasting jjobs time.

    Change-Id: I9191847a3f80045329c160e86655cc0a0e80831c
    Signed-off-by: Tim Rozet <trozet@redhat.com>