Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Keep the promise working dir in /src

    Otherwise npm install fails.

    Change-Id: I1be15bc83e0dfab1ad1471106326ff347385f31e
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index d1704a6..e91c5d6 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit d1704a679ce7d4d8251d9f6e057d47333b2923fe
+Subproject commit e91c5d62fff72089ba52c35a198f1f7a40ee9e17