Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Switch to snaps in orchestra testcases

    It also stops using the floating ip in userdata to avoid a race
    condition (all-in-one).

    The DNS server is now configured by Neutron instead of the testcases.

    Change-Id: I6efed71339d98403f7fd137ff50f1941b5b5a03c
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 8901655..d6c5f7e 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 8901655587941e853739760bd41f7a00cf71d61d
+Subproject commit d6c5f7efe042f24bad35dab461d8820a7d507f7b