Update git submodules

* Update docs/submodules/functest from branch 'stable/danube'
  - Logger must be a singleton
    
    It avoids creating a python object for every message printed.
    
    Change-Id: Ia42b59db9f7ce4eadc7e91da4d193db646b54d85
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
    (cherry picked from commit 0acb8eb018afd993c363c05da8a45091abc59fd9)
    

1 files changed, 0 insertions, 0 deletions

diff --git a/docs/submodules/functest b/docs/submodules/functest
-Subproject 2c48dfc2b32c577c4754c2f1df2e6becc9bf5af
+Subproject 555d7546711b67197c9daeb87e8a0415203b3b8