Update git submodules

Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Update/Add requirements to run ODL robot CSIT

    It conforms test_odl.py with the new RobotFramework API too.
    It also updates test-requirements.txt as required by the current
    implementation of run_unit_tests.sh.

    Co-Authored-By: Cédric Ollivier <cedric.ollivier@orange.com>
    Change-Id: Ibca0150a40d3b8a3f736be1e9dcbf9ce56af0299
    Signed-off-by: Jamo Luhrsen <jluhrsen@redhat.com>
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>