Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'stable/fraser'
  - Temporarily disable Snaps CreateRouterSuccessTests

    The test could be falsy regarding the possible external network
    configs [1]. This patch will be reverted as soon as the bug is closed
    [2].

    [1] https://build.opnfv.org/ci/view/functest/job/functest-apex-baremetal-daily-fraser/246/console
    [2] https://jira.opnfv.org/browse/SNAPS-320

    Change-Id: I680656b300f0d669e8d96bec6c94a4a804ebbecb
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
    (cherry picked from commit 74c4e99c18d00d80ce7a2c2f0c36e656a842b966)