Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'stable/euphrates'
  - Merge "Report duration and result when vping fails" into stable/euphrates
  - Report duration and result when vping fails

    It completes "Bug fix: vping_userdata test status was not properly
    reported" [1].

    [1] https://gerrit.opnfv.org/gerrit/#/c/43911/

    Change-Id: I7e8be6cd564a24ca174e63cfc295861c51cae8ed
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
    (cherry picked from commit 5ffb995c110be39364535f56c86c46d092b8cea0)