Update git submodules

* Update docs/submodules/functest from branch 'stable/danube'
  - Upgrade to the latest kingbird version

    Change-Id: I80015fa05811f11c2c62e4c87f6008bea279fbf7
    Signed-off-by: Dimitri Mazmanov <dimitri.mazmanov@ericsson.com>
    (cherry picked from commit 251b25f7dc3a42d3717e696a164a92510e21cb38)

diff --git a/docs/submodules/functest b/docs/submodules/functest
index e4ef989..cc8d4f7 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit e4ef989e04ccb6ca76235f70fb1886caf5c40a24
+Subproject commit cc8d4f76a969b4c064eb23504c909c41b79b5fe8