Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'stable/euphrates'
  - [vyos_vrouter] Support https endpoints

    JIRA: FUNCTEST-881

    vyos_vrouter did not support https endpoints [1].

    I fixed the following two points.
     1. Modifying blueprint of Cloudify.
     2. Changing nova client of utilvnf module.

    Point 1
     I added command of support https endpoint to blueprint of vyos_vrouter.
     The Blueprint of vyos_vrouter is on our github repository [2].
     I updated our repository.

    Point 2
     I changed nova client of utilvnf module.
     Utilvnf module is utility module of vyos_vrouter.
     Nova client of utilvnf module did not support https endpoints.
     So, I changed to use nova client of snaps.

    After fixed the source code, I confirmed the vyos_vrouter was succeeded in the following two environments.
     1. Our labs   (Instoller:fuel,    environment of https endpoints)
     2. Orange POD (Instoller:compass, environment of http endpoints)

    [1] https://jira.opnfv.org/browse/FUNCTEST-881
    [2] https://github.com/oolorg/opnfv-vnf-vyos-blueprint/blob/master/function-test-openstack-blueprint.yaml

    Change-Id: I468df0f2486a34bc558ad161eb7de44264549006
    Signed-off-by: ShuyaNakama <shuya.nakama@okinawaopenlabs.org>
    (cherry picked from commit fc0d8c601ce627d5f7b8c5e3eef73bd01c6db7d4)