Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'stable/euphrates'
  - Merge "Create a router in both vping scenarii" into stable/euphrates
  - Create a router in both vping scenarii

    It fixes vping_userdata as it allows getting metadata due to the
    gateway defined for the subnet.

    It could be noted that DHCP can add the route needed if no gateway is
    defined and if force_metadata is set in dhcp_agent.ini.

    Change-Id: Ia62e0f00e3d2caee6262dd9cd9966d1f21fe40d5
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
    (cherry picked from commit a691a8c2868d3f8af531e0bff513023c3a704aaf)