Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Complete the container opnfv-vnf

    It adds the following testcases:
      - aaa
      - orchestra_openims
      - orchestra_clearwaterims

    opera_vims is not yet integrated as it depends on Opera [1] and its
    package must be fixed before being installed in Functest [2].

    vyos_vrouter will be added when a package is available for installing
    opnfv-functest-vrouter [3].

    [1] https://wiki.opnfv.org/display/OPERA/Opera+Home
    [2] https://git.opnfv.org/opera/tree/requirements.txt
    [3] https://github.com/oolorg/opnfv-functest-vrouter

    Change-Id: Iccd4626ec29c1e9eb1c2accc81fdf1a9ae1e613f
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>