Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Remove openstack-requirements from requirements.txt"
  - Remove openstack-requirements from requirements.txt

    Change-Id: Iaaee0c3e1c5377a5064660ad8396cfd8a7c5e250
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 8e6430d..f175559 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 8e6430da874e14dd56357d0280ffe7497c7cf40e
+Subproject commit f17555971dc56efc9bcf198c90fb5237d9f68c9f