Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Fix container list logics

    The previous logic is buggy (e.g. vnfs are executed if arm64 [1])
    Vnf images have been hugely reduced that allows testing them in
    virtual deployments (see functest-virtual [2])

    [1] https://build.opnfv.org/ci/view/functest%20(Installer%20gates)/job/functest-fuel-baremetal-daily-master/lastFailedBuild/console
    [2] https://build.opnfv.org/ci/view/functest/job/functest-latest-daily/76/

    Change-Id: Iec26708b66cbf3fe92849425f2afdf39a89d4bbe
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>