Update git submodules

* Update docs/submodules/functest from branch 'stable/euphrates'
  - Merge "Publish Docker Slicing Presentation" into stable/euphrates
  - Publish Docker Slicing Presentation

    It published the presentation done in the Functest Breakout during
    last OPNFV Summit (2017 in Beijing) [1].

    Minor changes are planned to update it in a second change.

    Git now ignores pdf which may be generated via reveal.js.

    [1] http://testresults.opnfv.org/functest/dockerslicing/

    Change-Id: I2b6cf113c672320bf1bc34442bb267fd99012546
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
    (cherry picked from commit cb52dd523c58a6567b53ea5b79169295e1471117)

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 17ab989..7c1337c 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 17ab989e67dc6bbead799d62a39dcdb883433e89
+Subproject commit 7c1337c60414ec8904564708b8a9a39aaf8667ca