Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Stop using tempest version in Dockerfile

    The sed instruction is enhanced to automatically copy the version
    written in the OpenStack's upper-constraints.txt.

    Change-Id: Icbfde6fb097b1eaf880184c4f63de11854bfdb47
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index d24a8f4..f235348 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit d24a8f4bba627004ac4fcc27a8c85169c76cbb78
+Subproject commit f2353484ddcca794d2c86d3dbe4d026ac906643f