Update git submodules

* Update docs/submodules/functest from branch 'stable/euphrates'
  - Bug fix: vping_userdata test status was not properly reported

    vping_base is calling vping_userdata
    vping_user data could return only EX_TESTCASE_FAILED or EX_OK
    by default vping_base always returns EX_OK (based on self.result=100..)
    it returned EX_RUN_ERROR only if upper class report EX_RUN_ERROR

    that is why vping_userdata was always PASS even if the trace "Ping OK"
    cannot be retrieved from the Nova console

    it seems that when running the vping_userdata, we systematically got
     Failed to read iid from metadata

    Change-Id: If72441dd93bffada5c7a5399c87db68d7ebeebed
    Signed-off-by: Morgan Richomme <morgan.richomme@orange.com>
    (cherry picked from commit e36a14f6db0bc5ac93469bb553810de506f29bef)

diff --git a/docs/submodules/functest b/docs/submodules/functest
index af96104..b7f390c 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit af96104859b803ac52ae096b2529a67b0f1725af
+Subproject commit b7f390c91994cbcebac60e55f32a543cd4d46c1c