Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'stable/euphrates'
  - Merge "Fix connection error due to invalid lib version usage." into stable/euphrates
  - Fix connection error due to invalid lib version usage.

    Connection timeouts on "requests" objects was developped with
    requests 2.18 but target runtime is 2.12.
    Advanced timeout management of 2.18 is not available in 2.12.

    Change-Id: Ie6d81b91d4bcc0d73cffd007d9e46cdb19e47597
    Signed-off-by: Benoit HERARD <benoit.herard@orange.com>
    (cherry picked from commit 86d5c31424187329f69a7e0efaa9dbe0dac98e56)