Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Fix timeout (switch to synchronous calls)"
  - Fix timeout (switch to synchronous calls)

    It completes "Switch create_server timeout to default value" [1]
    which forbids waiting more that 180s (create_server was asynchronous).

    [1] https://gerrit.opnfv.org/gerrit/#/c/60423/2

    Change-Id: Icbf9ee48024fe9e10571c2bb7ca895d5828fb561
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 1e6b7a0..51b476d 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 1e6b7a08862b4a8ebe372fc5f3a46356181618f3
+Subproject commit 51b476da479b32ece3cee36dccd75191e0832940