Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Fix links in configguide.rst

    It also removes trailing whitespaces.

    Change-Id: I6a7e4aaff700a85ff1c0c2741624e9359441e0ac
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index e338c83..3c5240c 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit e338c837cfa7476ad83e355b6149c37adc1715a5
+Subproject commit 3c5240c50cf2a158a4cf033ab0268580dfe52754