Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Integrate the promise package"
  - Integrate the promise package

    Change-Id: I128bfa62b9ccd8e53683def329e8470693c2e556
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 13067de..c6502c8 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 13067de652d6ccdcfc85f0f5e65841b644d9a6e9
+Subproject commit c6502c8fc4f43e753ffe6d631643ddf43002d4dc