Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Create heat_stack_owner if required

    It allows testing OpenStack Queens and older [1].
    It will be improved in a second change for latest OpenStack releases
    (if deprecated).

    [1] https://build.opnfv.org/ci/view/functest/job/functest-apex-baremetal-daily-master/174/console

    Change-Id: I6e91e8c45d335aa606370c35b0a03b990e22c165
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index c5b8aff..1d68347 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit c5b8affdabf4de9f758d0ba47547aa78fb004801
+Subproject commit 1d6834734bda91a99a01d54c4485e022e1fb87a2