Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Unlink vnf from constants"
  - Unlink vnf from constants

    It generates a default description which all testcases can easily
    override.

    Change-Id: I81b97c394cf064088767cc934295602f01a7f739
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 8073104..81775c2 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 8073104c142f7e005bba18c96999a11af745fd95
+Subproject commit 81775c2aae62f1f96a54c27eed59cea9f9722de9