Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Set scheduler_available_filters to all

    It indicates all filters that are included with nova are enabled [1].

    [1] https://docs.openstack.org/tempest/latest/sampleconf.html

    Co-Authored-By: Viktor Tikkanen <viktor.tikkanen@nokia.com>
    Change-Id: I0d1943941d62d2eee418200c69e8198cd858383e
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 985508f..ff2ba1f 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 985508f0d0612414be46165e9d1af42ad33a1143
+Subproject commit ff2ba1fd18b05bf1b031e78d2589028968bbe906