Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Enhance patrole configurations

    It allows listing the OpenStack services tested or setting test
    exlusions (e.g. tests requiring GRE as overlay).

    It should be noted that Keystone and Nova can't currently be tested
    without their default policy.json.

    Change-Id: I8909694b4ffc315959504441f5ea0b1f3023fe7c
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 35a6fcd..8700960 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 35a6fcd790a173bb759499b43d25f081ed4adfed
+Subproject commit 8700960a0edf662734259273ca002f2ac2050e21