Update git submodules

* Update docs/submodules/functest from branch 'stable/euphrates'
  - Fix another typos in dockerslicing.md

    Change-Id: I16f28649b000e9370e7c71f36668c417854fb91e
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
    (cherry picked from commit 9a075b1187522047c931127d74fbdeb7fd6ac617)

diff --git a/docs/submodules/functest b/docs/submodules/functest
index c8c1f6d..a759ab6 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit c8c1f6d7fca36d3d5eb12c814b858d41f1f3e765
+Subproject commit a759ab6d7a2763f9b55af398163e905e207eef30