Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Sort keys when dumping json"
  - Sort keys when dumping json

    Otherwise dumping them could break some unit tests as they are
    unordered collections [1].

    [1] https://build.opnfv.org/ci/job/functest-verify-master/4122/

    Change-Id: I108e946926ae9690cf2421e565f2bb81500f9160
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 3a464d0..d71eadb 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 3a464d056668e66d8ea9d1786f17a5afb033fb6e
+Subproject commit d71eadbd067f590ab0f456dfcd603ce183b3779c