Update git submodules

* Update docs/submodules/functest from branch 'stable/fraser'
  - Simplify logging

    In order to collect logs from features running through
    functest framework (mainly for troubleshooting purposes),
    the logging mechanism has been updated accordingly.

    It should be noted that feature logs are printed in functest.log.
    All logs are now printed in functest.log whatever the namespace.

    JIRA: SFC-125

    Co-Authored-By: Cédric Ollivier <cedric.ollivier@orange.com>
    Change-Id: I6cb32e5553749023d490d553ae4653750c52e844
    Signed-off-by: Panagiotis Karalis <pkaralis@intracom-telecom.com>
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
    (cherry picked from commit ceaea7f0cb95bce7f71d29dff71d58654cf0e700)

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 50366aa..d988594 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 50366aa0a3e3ce06bcf7879317467020a6faa97c
+Subproject commit d988594d88450d5bd579d503225ba6ec35492b9d