Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'stable/gambia'
  - Update Snaps commit id

    It updates Snaps commit id to allow testing OVN [1]

    It should be noted Snaps doesn't create any stable branch.
    Then this patch can be cherry-picked asis in all branches.

    It takes the package renaming into account.

    [1] https://gerrit.opnfv.org/gerrit/#/c/64515/

    Change-Id: I1dbfe9a68c8448d117b7b074cf2b4ac64b65e139
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
    (cherry picked from commit 1c2663063db356cebd1d156abf89d47a15b4eb1e)