Update git submodules

* Update docs/submodules/functest from branch 'stable/fraser'
  - Fix pylint warnings in clearwater_ims_base

    Change-Id: I663bd2826e43ce888990b012df27ca94e2d49a8d
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
    (cherry picked from commit 020ac360117ad3dffceef7286b2a4888664f5cf4)

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 50049c5..e13e87d 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 50049c516d0346a072c69a66f9f5ce173718bc92
+Subproject commit e13e87d9d064c2427208104d3dacc9b8aee95b6e