Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Fix snaps commit id

    Snaps is part of main Functest testcases (Healthcheck).
    A fixed version has to be pulled.

    We will switch later to snaps packages instead of commit ids.

    Change-Id: Ibbc3f1009233ccfb67463b49203b756ea86d3121
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index d176e20..3b5a537 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit d176e20067368d834e8b77d4f685f48cb54d03f5
+Subproject commit 3b5a537a6ababd5d6a7157157ae4108ed21075c4