Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Precise Tempest tests list

    Else full mode could run tests defined in tempest plugins too [1].

    [1] https://docs.openstack.org/tempest/latest/plugin-registry.html

    Change-Id: I4355b03ba1b9ba47938f748c4f1a8822fd412142
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index df38438..4a54d6c 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit df3843843c4449585550e8a0bb8fcc79b43b7871
+Subproject commit 4a54d6ce17f4a3d57a304b3973e8b34ed07f26d6