Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Remove obsolete Functest utils

    Only 3 functions are kept as part of our framework:
      - execute_command_raise()
      - execute_command()
      - get_parameter_from_yaml()

    Change-Id: I966a1d6122391dae85aa3c77813ad2f1698ceb45
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 53cd7f8..ff4817e 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 53cd7f8176c996014decb7311d9f546f6b8f2497
+Subproject commit ff4817eb5e7e11780353c73a9c7d0f40948863be