Update git submodules

* Update docs/submodules/functest from branch 'stable/euphrates'
  - Complete dockerslicing.md

    It mainly precises that all requirements were not synchronized over
    the OPNFV projects in Danube and adds 2 OPNFV project poposals.

    Change-Id: I2e89f9cdf3db58d41acaa31560232807988bd84a
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
    (cherry picked from commit a56003230966320b10e47eddb42fa797735c1b71)

diff --git a/docs/submodules/functest b/docs/submodules/functest
index df48fcc..d68315b 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit df48fcce2ea7fea367789d9d7fd28996691accc4
+Subproject commit d68315b2bdd8ce3f9a7f2f238fa4a2b249990381