Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Delete TestCase.create_snapshot()"
  - Delete TestCase.create_snapshot()

    OSGC has been removed then this method can be safely removed.
    It also updates run_tests.py.

    Change-Id: I4030b7f0351d24d095313ae990b08e65d8f69115
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 7510ff6..a53fd64 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 7510ff6e0e8e66fa6aa85bd7fb5e698ed66256d8
+Subproject commit a53fd6452a077b1905ff8f5ae1d24bdd112f2f82