Update git submodules

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

    Change-Id: I80015fa05811f11c2c62e4c87f6008bea279fbf7
    Signed-off-by: Dimitri Mazmanov <dimitri.mazmanov@ericsson.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index fa399d4..251b25f 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit fa399d46b192dd4e986fbc68035a794e6d473edf
+Subproject commit 251b25f7dc3a42d3717e696a164a92510e21cb38